Tamas Rudnai wrote:
>> Probably not. The electronics for a clock isn't too difficult. The
>> toughest problem with a clock is getting it to keep the right time.
>>
>
> I am not sure about the rest of the world, but here in Europe there is the
> DCF77 so you can synchronise the watch to an atomic clock operated in
> Frankfurt, Germany. The radio signal circuit used to be quite difficult to
> build, however, nowadays you can buy these as a module and to interface it
> with PIC if fairly simple. Google is full of with example projects.

US-based time signal radio station:

http://en.wikipedia.org/wiki/WWVB

For other countries, see:

http://en.wikipedia.org/wiki/Atomic_clock#Radio_clocks

Vitaliy 

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