71 lines
1.7 KiB
Python
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)
|