[hdf-forum] time data

[Francesc Alted]

A Wednesday 17 June 2009 08:55:50 Vesa Paatero escrigué:
> Hello,
>
> Ger van Diepen wrote:
> > Another option is to use two long integer values (for seconds and
> > nanoseconds), but the arithmetic will require a bit more work.
>
> We made a decision about timestamp format recently, favoring a 64-bit
> integer of microseconds, starting from Jan 1, 1970 (like the Unix time).
> That spans over 580000 years, and a common starting point with Unix time
> facilitates date functions. The same idea could be applied for a 580-year
> span of nanoseconds.

For more ideas about date/time formats, you may want to have a look at a 
proposal [1] for implementing a couple of types (one for absolute times and 
the other for relative) in NumPy [2].  It seems that the NumPy crew is already 
in the implementation phase of it, so you may find it useful.

[1] http://projects.scipy.org/numpy/browser/trunk/doc/neps/datetime-
proposal3.rst
[2] http://numpy.scipy.org/

Regards,

-- 
Francesc Alted

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