diff --git a/forms/DatetimeField.php b/forms/DatetimeField.php
index 20b84eb79..347795a42 100644
--- a/forms/DatetimeField.php
+++ b/forms/DatetimeField.php
@@ -63,7 +63,7 @@ class DatetimeField extends FormField {
 			->addExtraClass('fieldgroup-field');
 		$this->timeField = TimeField::create($name . '[time]', false)
 			->addExtraClass('fieldgroup-field');
-		$this->timezoneField = new HiddenField($this->getName() . '[timezone]');
+		$this->timezoneField = new HiddenField($name . '[timezone]');
 		
 		parent::__construct($name, $title, $value);
 	}
@@ -77,6 +77,14 @@ class DatetimeField extends FormField {
 
 		return $this;
 	}
+
+	public function setName($name) {
+		parent::setName($name);
+
+		$this->dateField->setName($name . '[date]');
+		$this->timeField->setName($name . '[time]');
+		$this->timezoneField->setName($name . '[timezone]');
+	}
 	
 	public function FieldHolder($properties = array()) {
 		$config = array(
diff --git a/tests/forms/DatetimeFieldTest.php b/tests/forms/DatetimeFieldTest.php
index 7802bf444..d21dba211 100644
--- a/tests/forms/DatetimeFieldTest.php
+++ b/tests/forms/DatetimeFieldTest.php
@@ -214,6 +214,24 @@ class DatetimeFieldTest extends SapphireTest {
 		);
 	}
 
+	public function testGetName() {
+		$field = new DatetimeField('Datetime');
+		
+		$this->assertEquals('Datetime', $field->getName());
+		$this->assertEquals('Datetime[date]', $field->getDateField()->getName());
+		$this->assertEquals('Datetime[time]', $field->getTimeField()->getName());
+		$this->assertEquals('Datetime[timezone]', $field->getTimezoneField()->getName());
+	}
+
+	public function testSetName() {
+		$field = new DatetimeField('Datetime', 'Datetime');
+		$field->setName('CustomDatetime');
+		$this->assertEquals('CustomDatetime', $field->getName());
+		$this->assertEquals('CustomDatetime[date]', $field->getDateField()->getName());
+		$this->assertEquals('CustomDatetime[time]', $field->getTimeField()->getName());
+		$this->assertEquals('CustomDatetime[timezone]', $field->getTimezoneField()->getName());
+	}
+
 	protected function getMockForm() {
 		return new Form(
 			new Controller(),