Timestamp for configuration messages

[153957]

How is the timestamp for configuration messages determined?
A couple of years ago I ran some tests where I started one of the tests on 2011-11-27 14:26 (GPS time).
Since I started the HiSPARC DAQ at that time a configuration message was generated and sent to the datastore. It can be seen here:
http://data.hisparc.nl/api/station/94/config/2011/11/27/
The problem is the timestamp in the configuration is "2011-11-27 15:25" Which is offset by an hour.
The HiSPARC electronics does send a GPS timestamp with the configuration message (ID 42).
Perhaps the HiSPARC DAQ does not use that timestamp and simply adds its own using the local PC time.