Updating all setter methods on DBDate to return an instance of themselves

src/ORM/FieldType/DBDate.php

@@ -33,6 +33,7 @@ class DBDate extends DBField
      * @config
      * @see DBDateTime::nice_format
      * @see DBTime::nice_format
+     * @return $this
      */
     private static $nice_format = 'd/m/Y';
 
@@ -42,18 +43,19 @@ class DBDate extends DBField
             // don't try to evaluate empty values with strtotime() below, as it returns "1970-01-01" when it should be
             // saved as NULL in database
             $this->value = null;
-            return;
+            return $this;
         }
 
         // @todo This needs tidy up (what if you only specify a month and a year, for example?)
         if (is_array($value)) {
             if (!empty($value['Day']) && !empty($value['Month']) && !empty($value['Year'])) {
                 $this->value = $value['Year'] . '-' . $value['Month'] . '-' . $value['Day'];
-                return;
-            } else {
-                // return nothing (so checks below don't fail on an empty array)
-                return null;
             }
+            /*
+             * return $this whether successfully set values from array based
+             * input or not (so checks below don't fail on an empty array)
+             */
+            return $this;
         }
 
         // Default to NZ date format - strtotime expects a US date
@@ -67,12 +69,11 @@ class DBDate extends DBField
             try {
                 $date = new DateTime($value);
                 $this->value = $date->format('Y-m-d');
-                return;
             } catch (Exception $e) {
                 $this->value = null;
-                return;
             }
         }
+        return $this;
     }
 
     /**