Cool stuff,
did you keep a few vars to hold "last update" or last update time ?
And, wouldn't it be convienent to have a time server to give;
simple to read bytes........ yr,month,day-of-week, month day,hr,min,sec,AM/PM .......8 specific bytes in some order,
The request could be like .........Give Simple uP Time for EST (eastern standard time) and the server could do all calculations.

Don