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Author Topic: 9E+99 (VB to C++... arduino...)  (Read 606 times)
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michael_x
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« Reply #15 on: May 23, 2012, 09:58:15 am »
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> 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

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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 ?

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Pedro Ferrer
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« Reply #16 on: May 23, 2012, 10:07:47 am »
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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 smiley

Best regards
Pedro Ferrer
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Pedro Ferrer
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« Reply #17 on: May 23, 2012, 10:20:37 am »
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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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