On 5/13/17 6:58 PM, Mark Sims wrote:
Converting GPS seconds to Gregorian date/time on the Arduino will be an arduous
task. You take GPS seconds and add it to the GPS starring epoch to get a
Julian date. Then add in the number of leap seconds as a fraction of a day to
get UTC and possibly add in a time zone offset for local time. Don't forget to
do daylight savings time conversion... Then convert the result to Gregorian
date/time for display.
The problem is the Arduino floating point library is single precision only and
does not have the resolution needed to handle the numbers involved. Doing it
with integer arithmetic (long longs) opens up a whole new can of worms.
I don't know that this conversion is that hard on an Arduino, except
perhaps the daylight time (just because that's such a complex irregular
thing)
There's only 604,800 seconds in a week. that fits in a long quite
nicely. If you don't need to work too far into the past, you need a
table of weeks with appropriate metadata->what calendar date it
corresponds to, and whether there's a feb 29 or leap second.
(or do it with arithmetic for the leap years)
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