GPS time synch

Harald Welte laforge at
Tue Feb 20 20:25:14 CET 2007

On Tue, Feb 20, 2007 at 07:40:31PM +0100, Michael 'Mickey' Lauer wrote:

> > It appears that most (if not all) GSM providers include time information
> > in the signal.  Certainly I have observed this in North America and 
> > Europe.  It's probably a less power hungry way of keeping your clock in
> > sync.  Additionally, the GSM time info includes your local timezone and
> > DST status information.
> Yes that sounds like a good idea. I always wondered why I had to set
> the time and date on my mobile phone when it's included in GSM anyway.
> Harald, do we have access to this kind of information from Calypso?

unfortunately, AFAICT we can only obtain the Timezone change
notifications.  Maybe the timezone. But definitely not the time.

So by combining GPS time plus timezone from GSM, we might get it all

- Harald Welte <laforge at>         
Software for the world's first truly open Free Software mobile phone

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