TimePlotDate#

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

Bases: TimeFromEpoch

Matplotlib plot_date input: 1 + number of days from 0001-01-01 00:00:00 UTC.

This can be used directly in the matplotlib plot_date function:

>>> import matplotlib.pyplot as plt
>>> jyear = np.linspace(2000, 2001, 20)
>>> t = Time(jyear, format='jyear', scale='utc')
>>> plt.plot_date(t.plot_date, jyear)
>>> plt.gcf().autofmt_xdate()  # orient date labels at a slant
>>> plt.draw()

For example, 730120.0003703703 is midnight on January 1, 2000.

Attributes Summary

`epoch`	Reference epoch time from which the time interval is measured.
`epoch_format`
`epoch_scale`
`epoch_val`
`epoch_val2`
`in_subfmt`
`jd1`
`jd2`
`name`
`out_subfmt`
`precision`
`scale`	Time scale.
`subfmts`
`unit`
`value`	Return time representation from internal jd1 and jd2.

Methods Summary

`fill_value`(subfmt)	Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.
`set_jds`(val1, val2)	Initialize the internal jd1 and jd2 attributes given val1 and val2.
`to_value`([parent])	Return time representation from internal jd1 and jd2.

Attributes Documentation

epoch#: Reference epoch time from which the time interval is measured.

epoch_format = 'jd'#

epoch_scale = 'utc'#

epoch_val = 1721424.5#

epoch_val2 = None#

in_subfmt#

jd1#

jd2#

name = 'plot_date'#

out_subfmt#

precision#

scale#: Time scale.

subfmts = (('float', <class 'numpy.float64'>, None, <ufunc 'add'>), ('long', <class 'numpy.longdouble'>, <function longdouble_to_twoval>, <function twoval_to_longdouble>), ('decimal', <class 'numpy.object_'>, <numpy.vectorize object>, <numpy.vectorize object>), ('str', <class 'numpy.str_'>, <numpy.vectorize object>, <numpy.vectorize object>), ('bytes', <class 'numpy.bytes_'>, <numpy.vectorize object>, <numpy.vectorize object>))#

unit = 1.0#

value#

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.

set_jds(val1, val2)#: Initialize the internal jd1 and jd2 attributes given val1 and val2. For an TimeFromEpoch subclass like TimeUnix these will be floats giving the effective seconds since an epoch time (e.g. 1970-01-01 00:00:00).

to_value(parent=None, **kwargs)#: Return time representation from internal jd1 and jd2. Subclasses that require parent or to adjust the jds should override this method.