71 lines
1.7 KiB
Python
71 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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# This file is part of convertdate.
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# http://github.com/fitnr/convertdate
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# Licensed under the MIT license:
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# http://opensource.org/licenses/MIT
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# Copyright (c) 2016, fitnr <fitnr@fakeisthenewreal>
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from datetime import datetime
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from . import gregorian
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from . import julian
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from pytz import utc
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def to_datetime(jdc):
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'''Return a datetime for the input floating point Julian Day Count'''
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year, month, day = gregorian.from_jd(jdc)
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# in jdc: 0.0 = noon, 0.5 = midnight
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# the 0.5 changes it to 0.0 = midnight, 0.5 = noon
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frac = (jdc + 0.5) % 1
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hours = int(24 * frac)
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mfrac = frac * 24 - hours
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mins = int(60 * round(mfrac, 6))
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sfrac = mfrac * 60 - mins
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secs = int(60 * round(sfrac, 6))
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msfrac = sfrac * 60 - secs
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# down to ms, which are 1/1000 of a second
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ms = int(1000 * round(msfrac, 6))
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return datetime(year, month, day, int(hours), int(mins), int(secs), int(ms), tzinfo=utc)
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def from_datetime(dt):
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# take account of offset (if there isn't one, act like it's utc)
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try:
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dt = dt + dt.utcoffset()
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except TypeError:
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# Assuming UTC
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pass
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jdc = gregorian.to_jd(dt.year, dt.month, dt.day)
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hfrac = dt.hour / 24.
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mfrac = round(dt.minute / (24. * 60), 5)
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sfrac = round(dt.second / (24. * 60 * 60), 5)
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msfrac = dt.microsecond / (24. * 60 * 60 * 1000)
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return jdc + hfrac + mfrac + sfrac + msfrac
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def to_gregorian(jdc):
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return gregorian.from_jd(jdc)
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def from_gregorian(year, month, day):
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return gregorian.to_jd(year, month, day)
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def to_julian(jdc):
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return julian.from_jd(jdc)
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def from_julian(year, month, day):
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return julian.to_jd(year, month, day)
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