Hi, I solved it this way: <f:if condition="{f:format.date(date: object.dateTime, format: 'U')} == 0"> <f:then> </f:then> <f:else> <f:format.date format="Y-m-d">{object.dateTime}</f:format.date> </f:else> </f:if> Joerg Thomas "Thasmo" Deinhamer schrieb: > How can I check if a DateTime Object has a valid value?