Dear Stephen Bissel,
Am 26.05.2016 um 15:16 schrieb BISSELL, Stephen (AEROCONSEIL SA)
<[email protected]<mailto:[email protected]>>:
Is there any roadmap within HDF5 to implement / define a portable time type?
H5T_TIME is clearly not portable, and from python forum reports I see that
python, at least, regards HDF5 as lacking a basic time type.
Alternatively, is there a wide-spread “de facto” that most people are using to
represent time – e.g. double?
To be clear, I’m referring to a no-frills “seconds since start of epoch” type
of time with resolution down to (at least) microseconds, which would be used
for “timestamping” data. Given the user base that HDF5 supports, this problem
must have come up many times, with more demanding sub-second resolution.
Currently, we use a composite, but this means that the time field always has to
be treated in a “special” way, which is unsatisfactory. And at the most trivial
level, HDFView allows a quick sanity check of data by plotting one column
against another as abscissa …. except in the case of our composite time, where
I’m limited to plotting against the seconds part of the structure.
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we use a double calculated with the function given below:
double DoubleTime(void)
{
struct timeval now;
/* the resolution of this function is usec, if the machine supports this
and the mantissa of a double is 51 bits or more (31 bits for seconds
and 20 for microseconds)
*/
gettimeofday(&now, NULL);
return now.tv_sec + now.tv_usec / 1e6;
}
The code is for unix, of course, on windows your mileage will vary.
Best Regards,
Mark Koennecke
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