I've noticed that we're experiencing this bug which was previously seen at LHO. We cannot enter 10 digit GPS times into the time fields for DTT due to a limit in TLGEntry.cc, which Jim Batch fixed in September of last year. Seems like we're running an old version of the GDS tools.
I checked the Lidax tool (which you can get from the GDS Mainmenu). It does, in fact, allow 10 digit entries.