Jim,

> but surely all you need to do is read the RTC and the linux system
> time and compare them.

Why ?   If I actually can read the RTC than all I need to do is write it
into the Pi's clock and be done with it.

The thing is that the Pi can be given its time from a number of sources, and
my approach is to ask the clock itself (where a single check should to),
instead of trying to go thru all the possible sources.

> I see you think you have a "precise" realtime clock -
> do you know how well it keeps time?

Its a DS3231, which uses a temperature-controlled crystal to keep it as
precise as possible.

But its not the the Pi's clock drift that bothers me. Its that, without an
internet connection and being shut down and rebooted (much) later, it could
be running with yesterdays (or even before) date and time.

... Though I just realized that if the clock is saved on shutdown and
reloaded when its boots again (as I seem to remember) the filetimes not
being the actual time doesn't really interfere with being able to compare
them.   But that doesn't mean that I would not rather have them reflect the
actual time. :-)

Regards,
Rudy Wieser

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