Thanks, excellent code to do the fixup on Arduinos, etc. Heather already has Julian <-> Gregorian routines that use double precision numbers and allows date/time tweaks to millisecond levels, so I used those. I am modifying the rollover adjustment code to not latch onto a specific rollover compensation value. That was originally done for a couple of old receivers that did things rather bizarrely. Subsequent improvements to the code made that no longer necessary. So now Heather will be able to recover from date/time issues due to bogus dates that occur during receiver startup. -------------------- > Ah, more complicated math to solve a problem vs. simpler math to avoid a problem in the first place.