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Topic: 9E+99 (VB to C++... arduino...) (Read 1 time) previous topic - next topic

michael_x

Quote
> how can you safely compare dates with float ( or double ) numbers ?
Please check this calculator...
http://aa.usno.navy.mil/data/docs/JulianDate.php


So you can't, on an Arduino, even if you stick to full days

Quote
The Julian date for CE  2012 May 23 00:00:00.0 UT is
JD 2456070.500000

This is way beyond the accuracy of a 32 bit float

BTW: Curious about the used formula,why is a Julian Date related to a pacific timezone ?


Pedro Ferrer

Hello

Yes... if you want to retrieve seconds, minutes and hours from there, forget it with arduino (for now... with chipkit is possible, I think)... but days, months and years... are fine :)

Best regards
Pedro Ferrer

Pedro Ferrer

Hello

That's why we don't use that kind of valour... but shorter... eg: Julian date year 2000... is shorter... about 41xxx.xxxx days... until now...

Bye
Pedro Ferrer

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