TYPO3 Core

I tried to edit it and tested it. I enter 31-3-2009 and the result is:
1238450400
31.03.2009 00:00:00

Very hard to reproduce, perhaps it is a workspace problem because I am working with workspaces and publishing.

Now I know where the error occurs.
If an user edits a record and don't have access to the starttime, then the starttime gets "value - 1 hour" (I think because of the timezone GMT+1). You can then see it in the workspace overview where the differences of the records will be shown.

This function is the problem here:
typo3_src/t3lib/class.t3lib_tcemain.php
class t3lib_TCEmain {
function checkValue_input_Eval($value,$evalArray,$is_in) {
...
case 'date':
case 'datetime':
$value = intval($value);
if ($value>0 && !$this->dontProcessTransformations) {
$value -= date('Z', $value);
}
break;
...

If I deactivate it then all is fine, but then I have problems with date/datetime in Live-Workspace.

I forgot:
The user who edits the record is in a workspace, not on Live-Workspace and not on Draft-Workspace.

Resolved as duplicate of #19928

Thanks Sven for the hint.