diff -urNp typo3_src-4.2.10_orig/t3lib/class.t3lib_tceforms.php typo3_src-4.2.10/t3lib/class.t3lib_tceforms.php
--- typo3_src-4.2.10_orig/t3lib/class.t3lib_tceforms.php	2009-10-22 14:14:56.000000000 +0200
+++ typo3_src-4.2.10/t3lib/class.t3lib_tceforms.php	2009-11-12 11:22:01.000000000 +0100
@@ -1115,8 +1115,8 @@ class t3lib_TCEforms	{
 			$item.='<input type="checkbox" class="' . $this->formElStyleClassValue('check', TRUE) . ' alignToInputText"  name="' . $PA['itemFormElName'] . '_cb" onclick="'.htmlspecialchars($cOnClick) . '" />';
 		}
 		if ((in_array('date',$evalList) || in_array('datetime',$evalList)) && $PA['itemFormElValue']>0){
-				// Add server timezone offset to UTC to our stored date
-			$PA['itemFormElValue'] += date('Z', $PA['itemFormElValue']);
+				// Remove server timezone offset to UTC from our stored date
+			$PA['itemFormElValue'] -= date('Z', $PA['itemFormElValue']);
 		}
 
 		$PA['fieldChangeFunc'] = array_merge(array('typo3form.fieldGet'=>'typo3form.fieldGet('.$paramsList.');'), $PA['fieldChangeFunc']);
diff -urNp typo3_src-4.2.10_orig/t3lib/class.t3lib_tcemain.php typo3_src-4.2.10/t3lib/class.t3lib_tcemain.php
--- typo3_src-4.2.10_orig/t3lib/class.t3lib_tcemain.php	2009-10-22 14:14:56.000000000 +0200
+++ typo3_src-4.2.10/t3lib/class.t3lib_tcemain.php	2009-11-12 11:23:44.000000000 +0100
@@ -2016,7 +2016,8 @@ class t3lib_TCEmain	{
 				case 'datetime':
 					$value = intval($value);
 					if ($value>0 && !$this->dontProcessTransformations)	{
-						$value -= date('Z', $value);
+						// Add timezone offset to UTC to the input value
+						$value += date('Z', $value);
 					}
 				break;
 				case 'double2':