Opa_omroep-automatiseren/venv/lib/python3.8/site-packages/convertdate/julianday.py
Eljakim Herrewijnen f26bbbf103 initial
2020-12-27 21:00:11 +01:00

71 lines
1.7 KiB
Python

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