Convert rtems_clock_time_value to UTC (ascii)

[Rolf Schroedter]

My measurement data has an RTEMS timestamp in seconds,microseconds 
(rtems_clock_time_value). How can I convert this value later to 
human-readable UTC.
Obviously gmtime() cannot be used, because the RTEMS value has an offset 
to UNIX-style time_t.

Is there a constant #define'ed, which should be added to get a UNIX time_t ?

Thanks & regards,
ROLF.

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Rolf Schroedter
German Aerospace Center
Institute of Planetary Research
D-12489 Berlin, Rutherfordstrasse 2
Tel/Fax:  (+49) (30) 67055-416/384
Email:    Rolf.Schroedter at dlr.de