diff options
Diffstat (limited to 'io_import_dxf/dxfgrabber/juliandate.py')
| -rwxr-xr-x | io_import_dxf/dxfgrabber/juliandate.py | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/io_import_dxf/dxfgrabber/juliandate.py b/io_import_dxf/dxfgrabber/juliandate.py new file mode 100755 index 00000000..68c5c8e1 --- /dev/null +++ b/io_import_dxf/dxfgrabber/juliandate.py @@ -0,0 +1,73 @@ +# 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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