There is a bug in the SOS Unix client that causes an invalid date to be sent to the SOS Server.
See this link for details:
http://support.sourcegear.com/viewtopic.php?p=10226
Unable to checkin files in January (Unix client only)
Moderator: SourceGear
Unable to checkin files in January (Unix client only)
Linda Bauer
SourceGear
Technical Support Manager
SourceGear
Technical Support Manager