- // set contacts 'avatar-date' to "0000-00-00 00:00:00" to let poller to update urls\r
- $contact["avatar-date"] = "0000-00-00 00:00:00" ;\r
+ // set contacts 'avatar-date' to NULL_DATE to let poller to update urls\r
+ $contact["avatar-date"] = NULL_DATE;\r