Sometimes, the date format of ontologies uplaoded is broken. For example, see the PO, latest submission shows "Tue, 01 Jan 47856 12:44:08 GMT" (very far in the future).
and fixed PO latest release manually. if it needs to be done for other submissions anywhere you just need to download it by 1000 (also do it for lastSubDate)
Sometimes, the date format of ontologies uplaoded is broken. For example, see the PO, latest submission shows "Tue, 01 Jan 47856 12:44:08 GMT" (very far in the future).