[time-nuts] Thunderbolt Rollover

Tom Van Baak tvb at LeapSecond.com
Wed Sep 17 10:24:50 EDT 2014

Hi Mark,

Thanks for adding this fix to your software.

Note that handling GPS rollovers is easy when you use JD or MJD (Modified Julian Date) internally.
Since 1980-01-06 is MJD 44244 and 1024 weeks is 7168 days, the events occur at MJD 44244 + N*7168.
For the TBolt it's 44244 + 936*7 + (N-1)*7168, or 50796 + N*7168.

See also the gpsweek tool under http://leapsecond.com/tools/
Sample usage: gpsweek 1980 2100 | grep rollover


----- Original Message ----- 
From: "Mark Sims" <holrum at hotmail.com>
To: <time-nuts at febo.com>
Sent: Tuesday, September 16, 2014 1:41 PM
Subject: [time-nuts] Thunderbolt Rollover

> Version 4 of Lady Heather(not yet released) has rollover compensation built in.  If the detected date is less than the current system date it adds 1024 weeks to the Tbolt date/time by default.  You can also specify an alternate rollover offset or disable rollover compensation. 

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