TimeFITS#

class astropy.time.TimeFITS(val1, val2, scale, precision, in_subfmt, out_subfmt, from_jd=False)[source]#

Bases: TimeString

FITS format: “[±Y]YYYY-MM-DD[THH:MM:SS[.sss]]”.

ISOT but can give signed five-digit year (mostly for negative years);

The allowed subformats are:

‘date_hms’: date + hours, mins, secs (and optional fractional secs)
‘date’: date
‘longdate_hms’: as ‘date_hms’, but with signed 5-digit year
‘longdate’: as ‘date’, but with signed 5-digit year

See Rots et al., 2015, A&A 574:A36 (arXiv:1409.7583).

Attributes Summary

`in_subfmt`
`jd1`
`jd2`
`name`
`out_subfmt`
`precision`
`scale`	Time scale.
`subfmts`
`value`	Convert times to strings, using signed 5 digit if necessary.

Methods Summary

`fill_value`(subfmt)	Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.
`format_string`(str_fmt, **kwargs)	Write time to a string using a given format.
`get_jds_fast`(val1, val2)	Use fast C parser to parse time strings in val1 and get jd1, jd2.
`get_jds_python`(val1, val2)	Parse the time strings contained in val1 and get jd1, jd2.
`parse_string`(timestr, subfmts)	Read time and deprecated scale if present.
`set_jds`(val1, val2)	Parse the time strings contained in val1 and set jd1, jd2.
`str_kwargs`()	Generator that yields a dict of values corresponding to the calendar date and time for the internal JD values.
`to_value`([parent, out_subfmt])	Return time representation from internal jd1 and jd2 in specified `out_subfmt`.

Attributes Documentation

in_subfmt#

jd1#

jd2#

name = 'fits'#

out_subfmt#

precision#

scale#: Time scale.

subfmts = (('date_hms', re.compile('(?P<year>\\d{4})-(?P<mon>\\d\\d)-(?P<mday>\\d\\d)T(?P<hour>\\d\\d):(?P<min>\\d\\d):(?P<sec>\\d\\d(\\.\\d*)?)(\$(?P<scale>\\w+)(\\((?P<realization>\\w+)\$)?\\))?$'), '{year:04d}-{mon:02d}-{day:02d}T{hour:02d}:{min:02d}:{sec:02d}'), ('date', re.compile('(?P<year>\\d{4})-(?P<mon>\\d\\d)-(?P<mday>\\d\\d)(\$(?P<scale>\\w+)(\\((?P<realization>\\w+)\$)?\\))?$'), '{year:04d}-{mon:02d}-{day:02d}'), ('longdate_hms', re.compile('(?P<year>[+-]\\d{5})-(?P<mon>\\d\\d)-(?P<mday>\\d\\d)T(?P<hour>\\d\\d):(?P<min>\\d\\d):(?P<sec>\\d\\d(\\.\\d*)?)(\$(?P<scale>\\w+)(\\((?P<realization>\\w+)\$)?\\))?$'), '{year:+06d}-{mon:02d}-{day:02d}T{hour:02d}:{min:02d}:{sec:02d}'), ('longdate', re.compile('(?P<year>[+-]\\d{5})-(?P<mon>\\d\\d)-(?P<mday>\\d\\d)(\$(?P<scale>\\w+)(\\((?P<realization>\\w+)\$)?\\))?$'), '{year:+06d}-{mon:02d}-{day:02d}'))#

value#: Convert times to strings, using signed 5 digit if necessary.

Methods Documentation

classmethod fill_value(subfmt)#

Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.

This is used as a fill value for masked arrays to ensure that any ERFA operations on the masked array will not fail due to the masked value.

format_string(str_fmt, **kwargs)#

Write time to a string using a given format.

By default, just interprets str_fmt as a format string, but subclasses can add to this.

get_jds_fast(val1, val2)#: Use fast C parser to parse time strings in val1 and get jd1, jd2.

get_jds_python(val1, val2)#: Parse the time strings contained in val1 and get jd1, jd2.

parse_string(timestr, subfmts)[source]#: Read time and deprecated scale if present.

set_jds(val1, val2)#: Parse the time strings contained in val1 and set jd1, jd2.

str_kwargs()#: Generator that yields a dict of values corresponding to the calendar date and time for the internal JD values.

to_value(parent=None, out_subfmt=None)#

Return time representation from internal jd1 and jd2 in specified out_subfmt.

This is the base method that ignores parent and uses the value property to compute the output. This is done by temporarily setting self.out_subfmt and calling self.value. This is required for legacy Format subclasses prior to astropy 4.0 New code should instead implement the value functionality in to_value() and then make the value property be a simple call to self.to_value().

Parameters:

parentobject: Parent Time object associated with this TimeFormat object
out_subfmtstr or None: Output subformt (use existing self.out_subfmt if None)

Returns:

valuenumpy.array, numpy.ma.array: Array or masked array of formatted time representation values