[time-nuts] Setting correct date on Trimble Thunderbolt receiver

[Tom Van Baak]

Hi Mark,

> Heather keeps all times as a double precision Julian date.  Using Heather's code can
> be a problem on Arduinos since their "double" precision numbers are actually 32 bit
> single precision,  so you would need to do some more complicated math.

Ah, more complicated math to solve a problem vs. simpler math to avoid a problem in the first place.

Here's a simple "GPS Day Number" example: www.leapsecond.com/tools/gpsdn.c

To add 1024 weeks to a given date use:

    gpsdn = date_to_gpsdn(year, month, day);
    gpsdn += 1024 * 7;
    gpsdn_to_ymd(gpsdn, &year, &month, &day);

That's it. It uses 32 bit integers; no floating point required; works on any OS, or Arduino.

/tvb