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# Purpose: julian date
# Created: 21.03.2011
# Copyright (C) 2011, Manfred Moitzi
# License: MIT License
from __future__ import unicode_literals
__author__ = "mozman <mozman@gmx.at>"
from math import floor
from datetime import datetime
def frac(number):
return number - floor(number)
class JulianDate:
def __init__(self, date):
self.date = date
self.result = self.julian_date() + self.fractional_day()
def fractional_day(self):
seconds = self.date.hour * 3600. + self.date.minute * 60. + self.date.second
return seconds / 86400.
def julian_date(self):
y = self.date.year + (float(self.date.month) - 2.85) / 12.
A = floor(367. * y) - 1.75 * floor(y) + self.date.day
B = floor(A) - 0.75 * floor(y / 100.)
return floor(B) + 1721115.
class CalendarDate:
def __init__(self, juliandate):
self.jdate = juliandate
year, month, day = self.get_date()
hour, minute, second = frac2time(self.jdate)
self.result = datetime(year, month, day, hour, minute, second)
def get_date(self):
Z = floor(self.jdate)
if Z < 2299161:
A = Z # julian calender
else:
g = floor((Z - 1867216.25) / 36524.25) # gregorian calendar
A = Z + 1. + g - floor(g / 4.)
B = A + 1524.
C = floor((B - 122.1) / 365.25)
D = floor(365.25 * C)
E = floor((B - D) / 30.6001)
day = B - D - floor(30.6001 * E)
month = E - 1 if E < 14 else E - 13
year = C - 4716 if month > 2 else C - 4715
return int(year), int(month), int(day)
def frac2time(jdate):
seconds = int(frac(jdate) * 86400.)
hour = int(seconds / 3600)
seconds = seconds % 3600
minute = int(seconds / 60)
second = seconds % 60
return hour, minute, second
def julian_date(date):
return JulianDate(date).result
def calendar_date(juliandate):
return CalendarDate(juliandate).result
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