Mike,

> How about using ntp plus a cheap usb gps dongle to keep the time?

:-)   I already have a good (precise) RTC here which I could just tell
raspbian to use.   But thats not the problem I currently want to solve.
Seeing if /any/ of the clock-setting/synchronisation methods has been
applied is.

The target is to prohibit a program (python script in this case) from doing
filetime comparisions when the clock cannot be depended upon.   Like in your
case before the dongle has been able to synchronise to the gps sattelites.

Thanks for the suggestion though.

Regards,
Rudy Wieser

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