[Numpy-discussion] Time Zones and datetime64
Riccardo De Maria
Sat Apr 13 02:42:16 CDT 2013
Colin J. Williams <cjwilliams43 <at> gmail.com> writes:
> well, I don't see any timezone support in there at all. It appears the
> use UTC, though I"m not entierly sure from the docs what now() would
> So I think it's pretty much like my "use UTC" proposal.
I think so. There is no support for leap second either.
> It's not clear whether the Julian day is an integer or contains
> a fractional part.
> Colin W.
In SQLite the internal representation is Julian day * 86400 * 1000.
In astronomy the modified julian day is apparenly often used:
CCIR RECOMMENDATION 457-1, USE OF THE MODIFIED JULIAN DATE BY THE STANDARD
FREQUENCY AND TIME-SIGNAL SERVICES.
There is python library with classes that support several
time coordinate systems (TAI, UTC, ISO, JD, MJD, UNX, RDT, CDF, DOY, eDOY)
I also found those page useful for a quick recap.
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