diff --git a/admin/client/dist/styles/bundle.css b/admin/client/dist/styles/bundle.css
index b836322e7..d323dbf7e 100644
--- a/admin/client/dist/styles/bundle.css
+++ b/admin/client/dist/styles/bundle.css
@@ -8859,11 +8859,16 @@ fieldset{
   height:18px;
 }
 
-.field input.day,.field input.month,.field input.year{
+.field input.day,.field input.month{
   width:56px;
   display:inline;
 }
 
+.field input.year{
+  width:72px;
+  display:inline;
+}
+
 .field input.time{
   width:88px;
 }
diff --git a/admin/client/src/styles/legacy/_forms.scss b/admin/client/src/styles/legacy/_forms.scss
index 36fb6508d..dbcb5038c 100644
--- a/admin/client/src/styles/legacy/_forms.scss
+++ b/admin/client/src/styles/legacy/_forms.scss
@@ -295,10 +295,14 @@ form.small .field, .field.small {
 	}
 
 	/* Date Fields */
-	input.month, input.day, input.year {
+	input.month, input.day {
 		width: ($grid-x * 7);
     display: inline;
 	}
+  input.year {
+    width: ($grid-x * 9);
+    display: inline;
+  }
 
 	input.time {
 		width: ($grid-x * 11); // smaller time field, since input is restricted
diff --git a/docs/en/02_Developer_Guides/03_Forms/01_Validation.md b/docs/en/02_Developer_Guides/03_Forms/01_Validation.md
index 61422cd3d..a757f42be 100644
--- a/docs/en/02_Developer_Guides/03_Forms/01_Validation.md
+++ b/docs/en/02_Developer_Guides/03_Forms/01_Validation.md
@@ -66,12 +66,7 @@ Each individual [api:FormField] instance is responsible for validating the submi
 
 Subclasses of `FormField` can define their own version of `validate` to provide custom validation rules such as the 
 above example with the `Email` validation. The `validate` method on `FormField` takes a single argument of the current 
-`Validator` instance. 
-
-<div class="notice" markdown="1">
-The data value of the `FormField` submitted is not passed into validate. It is stored in the `value` property through 
-the `setValue` method.
-</div>
+`Validator` instance.
 
 ```php
 public function validate($validator)
diff --git a/docs/en/02_Developer_Guides/03_Forms/Field_types/02_DateField.md b/docs/en/02_Developer_Guides/03_Forms/Field_types/02_DateField.md
index d02519aca..71946f46f 100644
--- a/docs/en/02_Developer_Guides/03_Forms/Field_types/02_DateField.md
+++ b/docs/en/02_Developer_Guides/03_Forms/Field_types/02_DateField.md
@@ -3,8 +3,8 @@ summary: How to format and use the DateField class.
 
 # DateField
 
-This `FormField` subclass lets you display an editable date, either in a single text input field, or in three separate 
-fields for day, month and year. It also provides a calendar date picker.
+This `FormField` subclass lets you display an editable date, in a single text input field.
+It also provides a calendar date picker.
 
 The following example will add a simple DateField to your Page, allowing you to enter a date manually. 
 
@@ -33,14 +33,14 @@ The following example will add a simple DateField to your Page, allowing you to
 
 ## Custom Date Format
 
-A custom date format for a [api:DateField] can be provided through `setConfig`.
+A custom date format for a [api:DateField] can be provided through `setDateFormat`.
 
 	:::php
 	// will display a date in the following format: 31-06-2012
 	DateField::create('MyDate')->setDateFormat('dd-MM-yyyy'); 
 
 <div class="info" markdown="1">
-The formats are based on [Zend_Date constants](http://framework.zend.com/manual/1.12/en/zend.date.constants.html).
+The formats are based on [CLDR format](http://userguide.icu-project.org/formatparse/datetime).
 </div>
  
 
@@ -51,19 +51,16 @@ strtotime()).
 
 	:::php
 	DateField::create('MyDate')
-		->setConfig('min', '-7 days')
-		->setConfig('max', '2012-12-31')
+		->setMinDate('-7 days')
+		->setMaxDate'2012-12-31')
 		
 ## Separate Day / Month / Year Fields
 
-The following setting will display your DateField as three input fields for day, month and year separately. HTML5 
-placeholders 'day', 'month' and 'year' are enabled by default. 
+To display separate input fields for day, month and year separately you can use the `DateFieldSeparated` subclass`.
+HTML5 placeholders 'day', 'month' and 'year' are enabled by default. 
 
 	:::php
-	DateField::create('MyDate')
-		->setConfig('dmyfields', true)
-		->setConfig('dmyseparator', '/') // set the separator
-		->setConfig('dmyplaceholders', 'true'); // enable HTML 5 Placeholders
+	DateFieldSeparated::create('MyDate');
 
 <div class="alert" markdown="1">
 Any custom date format settings will be ignored. 
@@ -75,10 +72,13 @@ The following setting will add a Calendar to a single DateField, using the jQuer
 
 	:::php
 	DateField::create('MyDate')
-		->setConfig('showcalendar', true);
+		->setShowCalendar(true);
 
-The jQuery DatePicker doesn't support every constant available for `Zend_Date`. If you choose to use the calendar, the 
-following constants should at least be safe:
+The jQuery date picker will support most custom locale formats (if left as default).
+If setting an explicit date format via setDateFormat() then the below table of supported
+characters should be used.
+
+It is recommended to use numeric format, as `MMM` or `MMMM` month names may not always pass validation.
 
 Constant | xxxxx
 -------- | -----
@@ -94,15 +94,6 @@ y        | year (4 digits)
 yy       | year (2 digits)
 yyyy     | year (4 digits)
 
-Unfortunately the day- and monthname values in Zend Date do not always match those in the existing jQuery UI locale 
-files, so constants like `EEE` or `MMM`, for day and month names could break validation. To fix this we had to slightly 
-alter the jQuery locale files, situated in */framework/thirdparty/jquery-ui/datepicker/i18n/*, to match Zend_Date. 
-
-<div class="info">
-At this moment not all locale files may be present. If a locale file is missing, the DatePicker calendar will fallback 
-to 'yyyy-MM-dd' whenever day - and/or monthnames are used. After saving, the correct format will be displayed.  
-</div>
-
 ## Formatting Hints
 
 It's often not immediate apparent which format a field accepts, and showing the technical format (e.g. `HH:mm:ss`) is 
@@ -113,13 +104,14 @@ field description as an example.
 	$dateField = DateField::create('MyDate');
 
 	// Show long format as text below the field
-	$dateField->setDescription(sprintf(
-		_t('FormField.Example', 'e.g. %s', 'Example format'),
-		Convert::raw2xml(Zend_Date::now()->toString($dateField->getConfig('dateformat')))
+	$dateField->setDescription(_t(
+	    'FormField.Example',
+	     'e.g. {format}',
+	     [ 'format' =>  $dateField->getDateFormat() ]
 	));
 
 	// Alternatively, set short format as a placeholder in the field
-	$dateField->setAttribute('placeholder', $dateField->getConfig('dateformat'));
+	$dateField->setAttribute('placeholder', $dateField->getDateFormat());
 
 <div class="notice" markdown="1">
 Fields scaffolded through [api:DataObject::scaffoldCMSFields()] automatically have a description attached to them.
diff --git a/docs/en/04_Changelogs/4.0.0.md b/docs/en/04_Changelogs/4.0.0.md
index 1938f200c..f7a341e6e 100644
--- a/docs/en/04_Changelogs/4.0.0.md
+++ b/docs/en/04_Changelogs/4.0.0.md
@@ -942,6 +942,9 @@ specific functions.
   by the array key, or the `class` parameter value.
 * Uniqueness checks for `File.Name` is performed on write only (not in `setName()`)
 * Created `Resettable` interface to better declare objects which should be reset between tests.
+* Added a server requirement for the php-intl extension (shipped by default with most PHP distributions)
+* Replaced Zend_Date and Zend_Locale with the php-intl extension.
+* Consistently use CLDR date formats (rather than a mix of CLDR and date() formats)
 
 #### <a name="overview-general-removed"></a>General and Core Removed API
 
@@ -1052,17 +1055,23 @@ A very small number of methods were chosen for deprecation, and will be removed
 * `ChangeSet` and `ChangeSetItem` have been added for batch publishing of versioned dataobjects.
 * `DataObject.table_name` config can now be used to customise the database table for any record.
 * `DataObjectSchema` class added to assist with mapping between classes and tables.
-* `DBMoney` values are now treated as empty only Amount is null. Values without Currency
-  will be formatted in the default locale.
+* `DBMoney` values are now treated as empty only if `Amount` field is null. If an `Amount` value
+  is provided without a `Currency` specified, it will be formatted as per the current locale.
 
 The below methods have been added or had their functionality updated to `DBDate`, `DBTime` and `DBDatetime`
 * `getTimestamp()` added to get the respective date / time as unix timestamp (seconds since 1970-01-01)
-* `Format()` method now use CLDR format strings, rather than PHP format strings.
-  See http://userguide.icu-project.org/formatparse/datetime.
+* `Format()` method now use [CLDR format strings](http://userguide.icu-project.org/formatparse/datetime),
+  rather than [PHP format string](http://php.net/manual/en/function.date.php).
+  E.g. `d/m/Y H:i:s` (php format) should be replaced with to `dd/MM/y HH:mm:ss` (CLDR format).
 * getISOFormat() added which returns the standard date/time ISO 8601 pattern in CLDR format.
-* Dates passed in m/d/y format will now raise a notice but will be parsed.
-  Dates passed to constructors should follow ISO 8601 (y-m-d).
-* 2-digit years will raise a notice.
+* `setValue` method is now a lot more restrictive, and expects dates and times to be passed in
+  ISO 8601 format (y-MM-dd) or (HH:mm:ss). Certain date formats will attempt to parse with
+  the below restrictions:
+  - `/`, `.` or `-` are supported date separators, but will be replaced with `-` internally.
+  - US date formats (m-d-y / y-d-m) will not be supported and may be parsed incorrectly.
+    (Note: Date form fields will still support localised date formats).
+  - `dd-MM-y` will be converted to `y-MM-dd` internally.  
+  - 2-digit values for year will now raise errors.
 * `FormatFromSettings` will default to `Nice()` format if no member is logged in.
 * `Nice`, `Long` and `Full` methods will now follow standard formatting rules for the
   current locale, rather than pre-defined formats.
@@ -1071,7 +1080,6 @@ The below methods have been added or had their functionality updated to `DBDate`
 
 `DBTime` specific changes:
 * Added `DBTime::FormatFromSettings`
-* Added `DBTime::Nice12`
 
 #### <a name="overview-orm-removed"></a>ORM Removed API
 
@@ -1115,7 +1123,9 @@ The below methods have been added or had their functionality updated to `DBDate`
   - `days_between`
 * `nice_format` has been removed from `DBDate` / `DBTime` / `DBDatetime` has been removed in favour of
   locale-specific formatting for Nice()
-* Removed `DBTime::TwelveHour`
+* Removed several `DBTime` methods:
+  - `TwelveHour`
+  - `Nice24`
 * Removed some `DBMoney` methods due to lack of support in php-intl.
   - `NiceWithShortname`
   - `NiceWithName`
@@ -1235,6 +1245,9 @@ The following filesystem synchronisation methods and tasks are also removed
 * Introduced `AssetAdmin\Forms\UploadField` as a react-friendly version of UploadField. This may also
   be used in normal entwine forms for managing files in a similar way to UploadField. However, this
   does not support inline editing of files.
+* Added method `FormField::setSubmittedValue($value, $data)` to process input submitted from form
+  submission, in contrast to `FormField::setValue($value, $data)` which is intended to load its
+  value from the ORM. The second argument to setValue() has been added.
 
 The following methods and properties on `Requirements_Backend` have been renamed:
 
@@ -1320,6 +1333,7 @@ New `DatetimeField` methods replace `getConfig()` / `setConfig()`:
 * `getTimezone()` / `setTimezone()`
 * `getDateTimeOrder()` / `setDateTimeOrder()`
 * `getLocale()` / `setLocale()`
+* `datavaluefield` config is removed as internal data value is now fixed to ISO 8601 format
 
 New `DateField` methods replace `getConfig()` / `setConfig()`:
 
@@ -1328,9 +1342,9 @@ New `DateField` methods replace `getConfig()` / `setConfig()`:
 * `getMinDate()` / `setMinDate()`
 * `getMaxDate()` / `setMaxDate()`
 * `getPlaceholders()` / `setPlaceholders()`
-* `getSeparateDMYFields()` / `setSeparateDMYFields()`
 * `getClientLocale` / `setClientLocale`
 * `getLocale()` / `setLocale()`
+* option `dmyfields` is now superceded with an `SeparatedDateField` class
 
 New `TimeField` methods replace `getConfig()` / `setConfig()`
 
@@ -1370,6 +1384,7 @@ New `TimeField` methods replace `getConfig()` / `setConfig()`
  as they are obsolete.
 * Removed `DatetimeField`, `DateField` and `TimeField` methods `getConfig` and `setConfig`. Individual
   getters and setters for individual options are provided instead. See above for list of new methods.
+* Removed `NumericField_Readonly`. Use `setReadonly(true)` instead.
 
 ### <a name="overview-i18n"></a>i18n API
 
@@ -1383,20 +1398,20 @@ New `TimeField` methods replace `getConfig()` / `setConfig()`
   for all DataObject subclasses, rather than just the basename without namespace.
 * i18n key for locale-respective pluralisation rules added as '.PLURALS'. These can be configured
   within yaml in array format as per [ruby i18n pluralization rules](http://guides.rubyonrails.org/i18n.html#pluralization).
-* `i18n.all_locales` config moved to `Locales.locales`
-* `i18n.common_languages` config moved to `Locales.languages`
-* `i18n.likely_subtags` config moved to `Locales.likely_subtags`
-* `i18n.tinymce_lang` config moved to `TinyMCEConfig.tinymce_lang`
-* `i18n::get_tinymce_lang()` moved to `TinyMCEConfig::get_tinymce_lang()`
-* `i18n::get_locale_from_lang()` moved to `Locales::localeFromLang()`
-* `i18n::get_lange_from_locale()` moved to `Locales::langFromLocale()`
-* `i18n::validate_locale()` moved to `Locales::validate()`
-* `i18n::get_common_languages()` moved to `Locales::getLanguages()`
-* `i18n::get_locale_name()` moved to `Locales::localeName()`
-* `i18n::get_language_name()` moved to `Locales::languageName()`
-* `i18n.module_priority` config moved to `Sources.module_priority`
-* `i18n::get_owner_module()` moved to `ClassManifest::getOwnerModule()`
-* `i18n::get_existing_translations()` moved to `Sources::getKnownLocales()`
+* `i18n.all_locales` config moved to `SilverStripe\i18n\Data\Locales.locales`
+* `i18n.common_languages` config moved to `SilverStripe\i18n\Data\Locales.languages`
+* `i18n.likely_subtags` config moved to `SilverStripe\i18n\Data\Locales.likely_subtags`
+* `i18n.tinymce_lang` config moved to `SilverStripe\Forms\HTMLEditor\TinyMCEConfig.tinymce_lang`
+* `i18n::get_tinymce_lang()` moved to `SilverStripe\Forms\HTMLEditor\TinyMCEConfig::get_tinymce_lang()`
+* `i18n::get_locale_from_lang()` moved to `SilverStripe\i18n\Data\Locales::localeFromLang()`
+* `i18n::get_lange_from_locale()` moved to `SilverStripe\i18n\Data\Locales::langFromLocale()`
+* `i18n::validate_locale()` moved to `SilverStripe\i18n\Data\Locales::validate()`
+* `i18n::get_common_languages()` moved to `SilverStripe\i18n\Data\Locales::getLanguages()`
+* `i18n::get_locale_name()` moved to `SilverStripe\i18n\Data\Locales::localeName()`
+* `i18n::get_language_name()` moved to `SilverStripe\i18n\Data\Locales::languageName()`
+* `i18n.module_priority` config moved to `SilverStripe\i18n\Data\Sources.module_priority`
+* `i18n::get_owner_module()` moved to `SilverStripe\Core\Manifest\ClassManifest::getOwnerModule()`
+* `i18n::get_existing_translations()` moved to `SilverStripe\i18n\Data\Sources::getKnownLocales()`
 
 #### <a name="overview-i18n-removed"></a>i18n API Removed API
 
diff --git a/src/Forms/DateField.php b/src/Forms/DateField.php
index 8089a5360..6a24bad34 100644
--- a/src/Forms/DateField.php
+++ b/src/Forms/DateField.php
@@ -8,9 +8,7 @@ use InvalidArgumentException;
 use SilverStripe\ORM\FieldType\DBDatetime;
 
 /**
- * Form field to display an editable date string,
- * either in a single `<input type="text">` field,
- * or in three separate fields for day, month and year.
+ * Form used for editing a date stirng
  *
  * Caution: The form field does not include any JavaScript or CSS when used outside of the CMS context,
  * since the required frontend dependencies are included through CMS bundling.
@@ -29,11 +27,10 @@ use SilverStripe\ORM\FieldType\DBDatetime;
  *
  * # Usage
  *
- * ## Example: German dates with separate fields for day, month, year
+ * ## Example: Field localised with german date format
  *
  *   $f = new DateField('MyDate');
  *   $f->setLocale('de_DE');
- *   $f->setSeparateDMYFields(true);
  *
  * # Validation
  *
@@ -95,14 +92,6 @@ class DateField extends TextField
      */
     protected $placeholders = true;
 
-    /**
-     * Declare whether D, M and Y fields should be separate inputs.
-     * If set then only numeric values will be accepted.
-     *
-     * @var bool
-     */
-    protected $separateDMYFields = false;
-
     /**
      * Override locale for client side.
      *
@@ -145,16 +134,11 @@ class DateField extends TextField
     /**
      * Set if calendar should be shown on the frontend.
      *
-     * If set to true, disables separate DMY fields
-     *
      * @param bool $show
      * @return $this
      */
     public function setShowCalendar($show)
     {
-        if ($show && $this->getSeparateDMYFields()) {
-            throw new InvalidArgumentException("Can't separate DMY fields and show calendar popup");
-        }
         $this->showCalendar = $show;
         return $this;
     }
@@ -316,39 +300,6 @@ class DateField extends TextField
         return $attributes;
     }
 
-    public function Field($properties = array())
-    {
-        if (!$this->getSeparateDMYFields()) {
-            return parent::Field($properties);
-        }
-
-        // Three separate fields for day, month and year
-        $valArr = $this->iso8601ToArray($this->Value());
-        $fieldDay = NumericField::create($this->name . '[day]', false, $valArr ? $valArr['day'] : null)
-            ->addExtraClass('day')
-            ->setMaxLength(2);
-        $fieldMonth = NumericField::create($this->name . '[month]', false, $valArr ? $valArr['month'] : null)
-            ->addExtraClass('month')
-            ->setMaxLength(2);
-        $fieldYear = NumericField::create($this->name . '[year]', false, $valArr ? $valArr['year'] : null)
-            ->addExtraClass('year')
-            ->setMaxLength(4);
-
-        // Set placeholders
-        if ($this->getPlaceholders()) {
-            $fieldDay->setAttribute('placeholder', _t(__CLASS__ . '.DAY', 'Day'));
-            $fieldMonth->setAttribute('placeholder', _t(__CLASS__ . '.MONTH', 'Month'));
-            $fieldYear->setAttribute('placeholder', _t(__CLASS__ . '.YEAR', 'Year'));
-        }
-
-        // Join all fields
-        // @todo custom ordering based on locale
-        $sep = '&nbsp;<span class="separator">/</span>&nbsp;';
-        return $fieldDay->Field() . $sep
-            . $fieldMonth->Field() . $sep
-            . $fieldYear->Field();
-    }
-
     public function Type()
     {
         return 'date text';
@@ -364,11 +315,7 @@ class DateField extends TextField
     public function setSubmittedValue($value, $data = null)
     {
         // Save raw value for later validation
-        if ($this->isEmptyArray($value)) {
-            $this->rawValue = null;
-        } else {
-            $this->rawValue = $value;
-        }
+        $this->rawValue = $value;
 
         // Null case
         if (!$value) {
@@ -376,12 +323,6 @@ class DateField extends TextField
             return $this;
         }
 
-        // If loading from array convert
-        if (is_array($value)) {
-            $this->value = $this->arrayToISO8601($value);
-            return $this;
-        }
-
         // Parse from submitted value
         $this->value = $this->localisedToISO8601($value);
         return $this;
@@ -555,33 +496,6 @@ class DateField extends TextField
         return $this;
     }
 
-    /**
-     * Declare whether D, M and Y fields should be separate inputs.
-     * If set then only numeric values will be accepted.
-     *
-     * @return bool
-     */
-    public function getSeparateDMYFields()
-    {
-        return $this->separateDMYFields;
-    }
-
-    /**
-     * Set if we should separate D M and Y fields. If set to true, disabled calendar
-     * popup.
-     *
-     * @param bool $separate
-     * @return $this
-     */
-    public function setSeparateDMYFields($separate)
-    {
-        if ($separate && $this->getShowCalendar()) {
-            throw new InvalidArgumentException("Can't separate DMY fields and show calendar popup");
-        }
-        $this->separateDMYFields = $separate;
-        return $this;
-    }
-
     /**
      * @return string
      */
@@ -647,62 +561,6 @@ class DateField extends TextField
         return $config;
     }
 
-    /**
-     * Convert iso 8601 date to array (day / month / year)
-     *
-     * @param string $date
-     * @return array|null Array form, or null if not valid
-     */
-    public function iso8601ToArray($date)
-    {
-        if (!$date) {
-            return null;
-        }
-        $formatter = $this->getISO8601Formatter();
-        $timestamp = $formatter->parse($date);
-        if ($timestamp === false) {
-            return null;
-        }
-
-        // Format time manually into an array
-        return [
-            'day' => date('j', $timestamp),
-            'month' => date('n', $timestamp),
-            'year' => date('Y', $timestamp),
-        ];
-    }
-
-    /**
-     * Convert array to timestamp
-     *
-     * @param array $value
-     * @return string
-     */
-    public function arrayToISO8601($value)
-    {
-        if ($this->isEmptyArray($value)) {
-            return null;
-        }
-
-        // ensure all keys are specified
-        if (!isset($value['month']) || !isset($value['day']) || !isset($value['year'])) {
-            return null;
-        }
-
-        // Ensure valid range
-        if (!checkdate($value['month'], $value['day'], $value['year'])) {
-            return null;
-        }
-
-        // Note: Set formatter to strict for array input
-        $formatter = $this->getISO8601Formatter();
-        $timestamp = mktime(0, 0, 0, $value['month'], $value['day'], $value['year']);
-        if ($timestamp === false) {
-            return null;
-        }
-        return $formatter->format($timestamp);
-    }
-
     /**
      * Convert date localised in the current locale to ISO 8601 date
      *
@@ -776,15 +634,4 @@ class DateField extends TextField
     {
         return DateField_View_JQuery::create($this);
     }
-
-    /**
-     * Check if this array is empty
-     *
-     * @param $value
-     * @return bool
-     */
-    public function isEmptyArray($value)
-    {
-        return is_array($value) && !array_filter($value);
-    }
 }
diff --git a/src/Forms/HTMLEditor/TinyMCEConfig.php b/src/Forms/HTMLEditor/TinyMCEConfig.php
index 3fc83c33c..e51b68d6d 100644
--- a/src/Forms/HTMLEditor/TinyMCEConfig.php
+++ b/src/Forms/HTMLEditor/TinyMCEConfig.php
@@ -2,7 +2,6 @@
 
 namespace SilverStripe\Forms\HTMLEditor;
 
-use SilverStripe\Core\Config\Configurable;
 use SilverStripe\Core\Convert;
 use SilverStripe\Control\Controller;
 use SilverStripe\Control\Director;
diff --git a/src/Forms/MemberDatetimeOptionsetField.php b/src/Forms/MemberDatetimeOptionsetField.php
index 8e0913da7..e49b91e1b 100644
--- a/src/Forms/MemberDatetimeOptionsetField.php
+++ b/src/Forms/MemberDatetimeOptionsetField.php
@@ -159,7 +159,7 @@ class MemberDatetimeOptionsetField extends OptionsetField
     public function setValue($value, $data = null)
     {
         if (is_array($value)) {
-            throw new InvalidArgumentException("Invalid value");
+            throw new InvalidArgumentException("Invalid array value: Expected string");
         }
         return parent::setValue($value, $data);
     }
diff --git a/src/Forms/MoneyField.php b/src/Forms/MoneyField.php
index 58fe123ad..cfda10542 100644
--- a/src/Forms/MoneyField.php
+++ b/src/Forms/MoneyField.php
@@ -89,7 +89,7 @@ class MoneyField extends FormField
         $currencyValue = $this->fieldCurrency ? $this->fieldCurrency->dataValue() : null;
         $allowedCurrencies = $this->getAllowedCurrencies();
         if (count($allowedCurrencies) === 1) {
-            // Dropdown field for multiple currencies
+            // Hidden field for single currency
             $field = HiddenField::create("{$name}[Currency]");
             reset($allowedCurrencies);
             $currencyValue = key($allowedCurrencies);
@@ -164,7 +164,7 @@ class MoneyField extends FormField
                 'Currency' => $value->getCurrency(),
                 'Amount' => $value->getAmount(),
             ];
-        } else {
+        } elseif (!is_array($value)) {
             throw new InvalidArgumentException("Invalid currency format");
         }
 
@@ -232,8 +232,6 @@ class MoneyField extends FormField
     public function performReadonlyTransformation()
     {
         $clone = clone $this;
-        $clone->fieldAmount = $clone->fieldAmount->performReadonlyTransformation();
-        $clone->fieldCurrency = $clone->fieldCurrency->performReadonlyTransformation();
         $clone->setReadonly(true);
         return $clone;
     }
diff --git a/src/Forms/NumericField.php b/src/Forms/NumericField.php
index 122b149ee..63a2007fb 100644
--- a/src/Forms/NumericField.php
+++ b/src/Forms/NumericField.php
@@ -306,4 +306,11 @@ class NumericField extends TextField
         $this->scale = $scale;
         return $this;
     }
+
+    public function performReadonlyTransformation()
+    {
+        $field = clone $this;
+        $field->setReadonly(true);
+        return $field;
+    }
 }
diff --git a/src/Forms/NumericField_Readonly.php b/src/Forms/NumericField_Readonly.php
deleted file mode 100644
index 52a80f64c..000000000
--- a/src/Forms/NumericField_Readonly.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-namespace SilverStripe\Forms;
-
-/**
- * Readonly version of a numeric field.
- */
-class NumericField_Readonly extends ReadonlyField
-{
-    /**
-     * @return static
-     */
-    public function performReadonlyTransformation()
-    {
-        return clone $this;
-    }
-
-    /**
-     * @return string
-     */
-    public function Value()
-    {
-        return $this->value ?: '0';
-    }
-
-    public function getValueCast()
-    {
-        return 'Decimal';
-    }
-}
diff --git a/src/Forms/SeparatedDateField.php b/src/Forms/SeparatedDateField.php
new file mode 100644
index 000000000..dc6999a95
--- /dev/null
+++ b/src/Forms/SeparatedDateField.php
@@ -0,0 +1,136 @@
+<?php
+
+namespace SilverStripe\Forms;
+
+use SilverStripe\i18n\i18n;
+
+/**
+ * Date field with separate inputs for d/m/y
+ */
+class SeparatedDateField extends DateField
+{
+    public function Field($properties = array())
+    {
+        // Three separate fields for day, month and year
+        $valArr = $this->iso8601ToArray($this->dataValue());
+        $fieldDay = NumericField::create($this->name . '[day]', false, $valArr ? $valArr['day'] : null)
+            ->addExtraClass('day')
+            ->setHTML5(true)
+            ->setMaxLength(2);
+        $fieldMonth = NumericField::create($this->name . '[month]', false, $valArr ? $valArr['month'] : null)
+            ->addExtraClass('month')
+            ->setHTML5(true)
+            ->setMaxLength(2);
+        $fieldYear = NumericField::create($this->name . '[year]', false, $valArr ? $valArr['year'] : null)
+            ->addExtraClass('year')
+            ->setHTML5(true)
+            ->setMaxLength(4);
+
+        // Set placeholders
+        if ($this->getPlaceholders()) {
+            $fieldDay->setAttribute('placeholder', _t(__CLASS__ . '.DAY', 'Day'));
+            $fieldMonth->setAttribute('placeholder', _t(__CLASS__ . '.MONTH', 'Month'));
+            $fieldYear->setAttribute('placeholder', _t(__CLASS__ . '.YEAR', 'Year'));
+        }
+
+        // Join all fields
+        // @todo custom ordering based on locale
+        $sep = '&nbsp;<span class="separator">/</span>&nbsp;';
+        return $fieldDay->Field() . $sep
+            . $fieldMonth->Field() . $sep
+            . $fieldYear->Field();
+    }
+
+    /**
+     * Convert array to timestamp
+     *
+     * @param array $value
+     * @return string
+     */
+    public function arrayToISO8601($value)
+    {
+        if ($this->isEmptyArray($value)) {
+            return null;
+        }
+
+        // ensure all keys are specified
+        if (!isset($value['month']) || !isset($value['day']) || !isset($value['year'])) {
+            return null;
+        }
+
+        // Ensure valid range
+        if (!checkdate($value['month'], $value['day'], $value['year'])) {
+            return null;
+        }
+
+        // Note: Set formatter to strict for array input
+        $formatter = $this->getISO8601Formatter();
+        $timestamp = mktime(0, 0, 0, $value['month'], $value['day'], $value['year']);
+        if ($timestamp === false) {
+            return null;
+        }
+        return $formatter->format($timestamp);
+    }
+
+    /**
+     * Convert iso 8601 date to array (day / month / year)
+     *
+     * @param string $date
+     * @return array|null Array form, or null if not valid
+     */
+    public function iso8601ToArray($date)
+    {
+        if (!$date) {
+            return null;
+        }
+        $formatter = $this->getISO8601Formatter();
+        $timestamp = $formatter->parse($date);
+        if ($timestamp === false) {
+            return null;
+        }
+
+        // Format time manually into an array
+        return [
+            'day' => date('j', $timestamp),
+            'month' => date('n', $timestamp),
+            'year' => date('Y', $timestamp),
+        ];
+    }
+
+    /**
+     * Assign value posted from form submission
+     *
+     * @param mixed $value
+     * @param mixed $data
+     * @return $this
+     */
+    public function setSubmittedValue($value, $data = null)
+    {
+        // Filter out empty arrays
+        if ($this->isEmptyArray($value)) {
+            $value = null;
+        }
+        $this->rawValue = $value;
+
+        // Null case
+        if (!$value || !is_array($value)) {
+            $this->value = null;
+            return $this;
+        }
+
+        // Parse
+        $this->value = $this->arrayToISO8601($value);
+        return $this;
+    }
+
+    /**
+     * Check if this array is empty
+     *
+     * @param $value
+     * @return bool
+     */
+    public function isEmptyArray($value)
+    {
+        return is_array($value) && !array_filter($value);
+    }
+}
diff --git a/src/ORM/FieldType/DBDate.php b/src/ORM/FieldType/DBDate.php
index 461530acc..1e1fd26e8 100644
--- a/src/ORM/FieldType/DBDate.php
+++ b/src/ORM/FieldType/DBDate.php
@@ -38,7 +38,7 @@ class DBDate extends DBField
         $value = $this->parseDate($value);
         if ($value === false) {
             throw new InvalidArgumentException(
-                "Invalid date passed. Use " . self::ISO_DATE . " to prevent this error."
+                "Invalid date: '$value'. Use " . self::ISO_DATE . " to prevent this error."
             );
         }
         $this->value = $value;
@@ -308,10 +308,7 @@ class DBDate extends DBField
      */
     public function Rfc2822()
     {
-        if ($this->value) {
-            return date('Y-m-d H:i:s', $this->getTimestamp());
-        }
-        return null;
+        return $this->Format('y-MM-dd HH:mm:ss');
     }
 
     /**
@@ -321,15 +318,13 @@ class DBDate extends DBField
      */
     public function Rfc3339()
     {
-        if (!$this->value) {
+        $date = $this->Format('y-MM-dd\\THH:mm:ss');
+        if (!$date) {
             return null;
         }
 
-        $timestamp = $this->getTimestamp();
-        $date = date('Y-m-d\TH:i:s', $timestamp);
-
         $matches = array();
-        if (preg_match('/^([\-+])(\d{2})(\d{2})$/', date('O', $timestamp), $matches)) {
+        if (preg_match('/^([\-+])(\d{2})(\d{2})$/', date('O', $this->getTimestamp()), $matches)) {
             $date .= $matches[1].$matches[2].':'.$matches[3];
         } else {
             $date .= 'Z';
@@ -541,23 +536,13 @@ class DBDate extends DBField
     protected function fixInputDate($value)
     {
         // split
-        list($day, $month, $year, $time) = $this->explodeDateString($value);
-
-        // Detect invalid year order
-        if (!checkdate($month, $day, $year) && checkdate($month, $year, $day)) {
-            trigger_error(
-                "Unexpected date order. Use " . self::ISO_DATE . " to prevent this notice.",
-                E_USER_NOTICE
-            );
-            list($day, $year) = [$year, $day];
-        }
-
-        // Fix y2k year
-        $year = $this->guessY2kYear($year);
+        list($year, $month, $day, $time) = $this->explodeDateString($value);
 
         // Validate date
         if (!checkdate($month, $day, $year)) {
-            throw new InvalidArgumentException("Invalid date passed. Use " . self::ISO_DATE . " to prevent this error.");
+            throw new InvalidArgumentException(
+                "Invalid date: '$value'. Use " . self::ISO_DATE . " to prevent this error."
+            );
         }
 
         // Convert to y-m-d
@@ -565,65 +550,39 @@ class DBDate extends DBField
     }
 
     /**
-     * Attempt to split date string into day, month, year, and timestamp components.
-     * Don't read this code without a drink in hand!
+     * Attempt to split date string into year, month, day, and timestamp components.
      *
      * @param string $value
      * @return array
      */
     protected function explodeDateString($value)
     {
-        // US date format with 4-digit year first
-        if (preg_match('#^(?<year>\\d{4})/(?<day>\\d+)/(?<month>\\d+)(?<time>.*)$#', $value, $matches)) {
-            trigger_error(
-                "Implicit y/d/m conversion. Use " . self::ISO_DATE . " to prevent this notice.",
-                E_USER_NOTICE
+        // split on known delimiters (. / -)
+        if (!preg_match(
+            '#^(?<first>\\d+)[-/\\.](?<second>\\d+)[-/\\.](?<third>\\d+)(?<time>.*)$#',
+            $value,
+            $matches
+        )) {
+            throw new InvalidArgumentException(
+                "Invalid date: '$value'. Use " . self::ISO_DATE . " to prevent this error."
             );
-            return [$matches['day'], $matches['month'], $matches['year'], $matches['time']];
         }
 
-        // US date format without 4-digit year first: assume m/d/y
-        if (preg_match('#^(?<month>\\d+)/(?<day>\\d+)/(?<year>\\d+)(?<time>.*)$#', $value, $matches)) {
-            // Assume m/d/y
-            trigger_error(
-                "Implicit m/d/y conversion. Use " . self::ISO_DATE . " to prevent this notice.",
-                E_USER_NOTICE
+        $parts = [
+            $matches['first'],
+            $matches['second'],
+            $matches['third']
+        ];
+        // Flip d-m-y to y-m-d
+        if ($parts[0] < 1000 && $parts[2] > 1000) {
+            $parts = array_reverse($parts);
+        }
+        if ($parts[0] < 1000) {
+            throw new InvalidArgumentException(
+                "Invalid date: '$value'. Use " . self::ISO_DATE . " to prevent this error."
             );
-            return [$matches['day'], $matches['month'], $matches['year'], $matches['time']];
         }
-
-        // check d.m.y
-        if (preg_match('#^(?<day>\\d+)\\.(?<month>\\d+)\\.(?<year>\\d+)(?<time>.*)$#', $value, $matches)) {
-            return [$matches['day'], $matches['month'], $matches['year'], $matches['time']];
-        }
-
-        // check y-m-d
-        if (preg_match('#^(?<year>\\d+)\\-(?<month>\\d+)\\-(?<day>\\d+)(?<time>.*)$#', $value, $matches)) {
-            return [$matches['day'], $matches['month'], $matches['year'], $matches['time']];
-        }
-
-        throw new InvalidArgumentException(
-            "Invalid date passed. Use " . self::ISO_DATE . " to prevent this error."
-        );
-    }
-
-    /**
-     * @param int $year
-     * @return int Fixed year
-     */
-    protected function guessY2kYear($year)
-    {
-        // Fix y2k
-        if ($year < 100) {
-            trigger_error("Implicit y2k conversion. Please use full YYYY year for dates", E_USER_NOTICE);
-            if ($year >= 70) {
-                // 70 -> 99 converted to 19(x)
-                $year += 1900;
-            } else {
-                // 0 -> 69 converted to 20(x)
-                $year += 2000;
-            }
-        }
-        return $year;
+        $parts[] = $matches['time'];
+        return $parts;
     }
 }
diff --git a/src/ORM/FieldType/DBTime.php b/src/ORM/FieldType/DBTime.php
index 83fb11f4d..d6eac7f06 100644
--- a/src/ORM/FieldType/DBTime.php
+++ b/src/ORM/FieldType/DBTime.php
@@ -110,26 +110,6 @@ class DBTime extends DBField
         return $formatter->format($this->getTimestamp());
     }
 
-    /**
-     * Returns the time in 12-hour format using the format string 'h:mm a' e.g. '1:32 pm'.
-     *
-     * @return string Formatted time.
-     */
-    public function Nice12()
-    {
-        return $this->Format('h:mm a');
-    }
-
-    /**
-     * Returns the time in 24-hour format using the format string 'H:mm' e.g. '13:32'.
-     *
-     * @return string Formatted time.
-     */
-    public function Nice24()
-    {
-        return $this->Format('H:mm');
-    }
-
     /**
      * Return the time using a particular formatting string.
      *
diff --git a/src/i18n/Data/Intl/IntlLocales.php b/src/i18n/Data/Intl/IntlLocales.php
index b0cbdee25..1a672df21 100644
--- a/src/i18n/Data/Intl/IntlLocales.php
+++ b/src/i18n/Data/Intl/IntlLocales.php
@@ -1606,8 +1606,8 @@ class IntlLocales implements Locales, Resettable
             return false;
         }
         return strcasecmp($lang, $region)
-            * strcasecmp($lang, $locale)
-            * strcasecmp($region, $locale) !== 0;
+            && strcasecmp($lang, $locale)
+            && strcasecmp($region, $locale);
     }
 
     /**
diff --git a/tests/php/Forms/DateFieldTest.php b/tests/php/Forms/DateFieldTest.php
index 34dcd9e1b..8cceffef1 100644
--- a/tests/php/Forms/DateFieldTest.php
+++ b/tests/php/Forms/DateFieldTest.php
@@ -4,6 +4,7 @@ namespace SilverStripe\Forms\Tests;
 
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\Forms\DateField;
+use SilverStripe\Forms\SeparatedDateField;
 use SilverStripe\Forms\RequiredFields;
 use SilverStripe\i18n\i18n;
 use SilverStripe\ORM\FieldType\DBDatetime;
@@ -110,8 +111,7 @@ class DateFieldTest extends SapphireTest
 
     public function testSetValueWithDateArray()
     {
-        $f = new DateField('Date', 'Date');
-        $f->setSeparateDMYFields(true);
+        $f = new SeparatedDateField('Date', 'Date');
         $f->setSubmittedValue([
             'day' => 29,
             'month' => 03,
@@ -147,10 +147,8 @@ class DateFieldTest extends SapphireTest
 
     public function testEmptyValueValidation()
     {
-        $field = new DateField('Date');
         $validator = new RequiredFields();
-        $this->assertTrue($field->validate($validator));
-        $field->setSeparateDMYFields(true);
+        $field = new SeparatedDateField('Date');
         $this->assertTrue($field->validate($validator));
         $field->setSubmittedValue([
             'day' => '',
@@ -162,8 +160,7 @@ class DateFieldTest extends SapphireTest
 
     public function testValidateArray()
     {
-        $f = new DateField('Date', 'Date');
-        $f->setSeparateDMYFields(true);
+        $f = new SeparatedDateField('Date', 'Date');
         $f->setSubmittedValue([
             'day' => 29,
             'month' => 03,
@@ -193,9 +190,7 @@ class DateFieldTest extends SapphireTest
 
     public function testValidateEmptyArrayValuesSetsNullForValueObject()
     {
-        $f = new DateField('Date', 'Date');
-        $f->setSeparateDMYFields(true);
-
+        $f = new SeparatedDateField('Date', 'Date');
         $f->setSubmittedValue([
             'day' => '',
             'month' => '',
@@ -213,7 +208,7 @@ class DateFieldTest extends SapphireTest
 
     public function testValidateArrayValue()
     {
-        $f = new DateField('Date', 'Date');
+        $f = new SeparatedDateField('Date', 'Date');
         $f->setSubmittedValue(['day' => 29, 'month' => 03, 'year' => 2003]);
         $this->assertTrue($f->validate(new RequiredFields()));
 
diff --git a/tests/php/Forms/DatetimeFieldTest.php b/tests/php/Forms/DatetimeFieldTest.php
index 3c0260f29..eb5e03b35 100644
--- a/tests/php/Forms/DatetimeFieldTest.php
+++ b/tests/php/Forms/DatetimeFieldTest.php
@@ -7,6 +7,7 @@ use SilverStripe\Control\Controller;
 use SilverStripe\Forms\DatetimeField;
 use SilverStripe\Forms\RequiredFields;
 use SilverStripe\Forms\DateField;
+use SilverStripe\Forms\SeparatedDateField;
 use SilverStripe\Forms\Tests\DatetimeFieldTest\Model;
 use SilverStripe\Forms\TimeField;
 use SilverStripe\Forms\FieldList;
@@ -107,7 +108,7 @@ class DatetimeFieldTest extends SapphireTest
     public function testSetValueWithDmyArray()
     {
         $f = new DatetimeField('Datetime', 'Datetime');
-        $f->getDateField()->setSeparateDMYFields(true);
+        $f->setDateField(new SeparatedDateField('Datetime[date]'));
         $f->setSubmittedValue([
             'date' => ['day' => 29, 'month' => 03, 'year' => 2003],
             'time' => '11:00:00 pm'
diff --git a/tests/php/Forms/NumericFieldTest.php b/tests/php/Forms/NumericFieldTest.php
index 07fbeb6c0..73bb2f7be 100644
--- a/tests/php/Forms/NumericFieldTest.php
+++ b/tests/php/Forms/NumericFieldTest.php
@@ -107,9 +107,13 @@ class NumericFieldTest extends SapphireTest
 
     public function testReadonly()
     {
-        i18n::set_locale('en_US');
         $field = new NumericField('Number');
-        $this->assertRegExp("#<span[^>]+>\s*0\s*<\/span>#", "".$field->performReadonlyTransformation()->Field()."");
+        $field->setLocale('de_DE');
+        $field->setScale(2);
+        $field->setValue(1001.3);
+        $html = $field->performReadonlyTransformation()->Field()->forTemplate();
+        $this->assertContains('value="1.001,30"', $html);
+        $this->assertContains('readonly="readonly"', $html);
     }
 
     public function testNumberTypeOnInputHtml()
diff --git a/tests/php/ORM/DBDateTest.php b/tests/php/ORM/DBDateTest.php
index d209d9665..fd38a96ac 100644
--- a/tests/php/ORM/DBDateTest.php
+++ b/tests/php/ORM/DBDateTest.php
@@ -94,96 +94,30 @@ class DBDateTest extends SapphireTest
 
     public function testMDYConversion()
     {
-        // Disable notices
-        $this->suppressNotices();
-
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '3/4/2003')->Nice(),
-            "Date->Nice() works with M/D/YYYY format"
-        );
-
         $this->setExpectedException(
-            PHPUnit_Framework_Error_Notice::class,
-            "Implicit m/d/y conversion. Use " . DBDate::ISO_DATE . " to prevent this notice."
+            \InvalidArgumentException::class,
+            "Invalid date: '3/16/2003'. Use " . DBDate::ISO_DATE . " to prevent this error."
         );
-        $this->restoreNotices();
-        DBField::create_field('Date', '3/4/2003');
-    }
-
-    public function testYDMConversion()
-    {
-        // Disable notices
-        $this->suppressNotices();
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '2003/4/3')->Nice(),
-            "Date->Nice() works with YYYY/D/M format"
-        );
-
-        $this->setExpectedException(
-            PHPUnit_Framework_Error_Notice::class,
-            "Implicit y/d/m conversion. Use " . DBDate::ISO_DATE . " to prevent this notice."
-        );
-        $this->restoreNotices();
-        DBField::create_field('Date', '2003/4/3');
+        DBField::create_field('Date', '3/16/2003');
     }
 
     public function testY2kCorrection()
     {
-        $this->suppressNotices();
-
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '4.3.03')->Nice(),
-            "Date->Nice() works with D.M.YY format"
-        );
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '04.03.03')->Nice(),
-            "Date->Nice() works with DD.MM.YY format"
-        );
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '4.3.03')->Nice(),
-            "Date->Nice() works with D.M.YY format"
-        );
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '4.03.03')->Nice(),
-            "Date->Nice() works with D.M.YY format"
-        );
-        $this->assertEquals(
-            '4/03/2003',
-            DBField::create_field('Date', '03-03-04')->Nice(),
-            "Date->Nice() works with Y-m-d format"
-        );
-
         $this->setExpectedException(
-            PHPUnit_Framework_Error_Notice::class,
-            "Implicit y2k conversion. Please use full YYYY year for dates"
+            \InvalidArgumentException::class,
+            "Invalid date: '03-03-04'. Use " . DBDate::ISO_DATE . " to prevent this error."
         );
-        $this->restoreNotices();
         DBField::create_field('Date', '03-03-04');
     }
 
     public function testInvertedYearCorrection()
     {
-        $this->suppressNotices();
-
-        // iso8601 expects year first
+        // iso8601 expects year first, but support year last
         $this->assertEquals(
             '4/03/2003',
             DBField::create_field('Date', '04-03-2003')->Nice(),
             "Date->Nice() works with DD-MM-YYYY format"
         );
-
-        $this->setExpectedException(
-            PHPUnit_Framework_Error_Notice::class,
-            "Unexpected date order. Use " . DBDate::ISO_DATE . " to prevent this notice."
-        );
-        $this->restoreNotices();
-        DBField::create_field('Date', '04-03-2003');
     }
 
     public function testYear()
@@ -400,7 +334,6 @@ class DBDateTest extends SapphireTest
         return [
             ['2000-12-31', '31/12/2000'],
             ['31-12-2000', '31/12/2000'],
-            ['12/31/2000', '31/12/2000'],
             ['2014-04-01', '01/04/2014'],
         ];
     }
diff --git a/tests/php/ORM/DBTimeTest.php b/tests/php/ORM/DBTimeTest.php
index 4b27e0a24..d43293baa 100644
--- a/tests/php/ORM/DBTimeTest.php
+++ b/tests/php/ORM/DBTimeTest.php
@@ -57,18 +57,6 @@ class DBTimeTest extends SapphireTest
         $this->assertEquals('5:15 PM', $time->Short());
     }
 
-    public function testNice12()
-    {
-        $time = DBTime::create_field('Time', '17:15:55');
-        $this->assertEquals('5:15 PM', $time->Nice12());
-    }
-
-    public function testNice24()
-    {
-        $time = DBTime::create_field('Time', '17:15:55');
-        $this->assertEquals('17:15', $time->Nice24());
-    }
-
     public function dataTestFormatFromSettings()
     {
         return [