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"""
Copyright (c) 2003-2007  Gustavo Niemeyer <gustavo@niemeyer.net>

This module offers extensions to the standard python 2.3+
datetime module.
"""
__author__ = "Gustavo Niemeyer <gustavo@niemeyer.net>"
__license__ = "PSF License"

import datetime

__all__ = ["easter", "EASTER_JULIAN", "EASTER_ORTHODOX", "EASTER_WESTERN"]

EASTER_JULIAN   = 1
EASTER_ORTHODOX = 2
EASTER_WESTERN  = 3

def easter(year, method=EASTER_WESTERN):
    """
    This method was ported from the work done by GM Arts,
    on top of the algorithm by Claus Tondering, which was
    based in part on the algorithm of Ouding (1940), as
    quoted in "Explanatory Supplement to the Astronomical
    Almanac", P.  Kenneth Seidelmann, editor.

    This algorithm implements three different easter
    calculation methods:
    
    1 - Original calculation in Julian calendar, valid in
        dates after 326 AD
    2 - Original method, with date converted to Gregorian
        calendar, valid in years 1583 to 4099
    3 - Revised method, in Gregorian calendar, valid in
        years 1583 to 4099 as well

    These methods are represented by the constants:

    EASTER_JULIAN   = 1
    EASTER_ORTHODOX = 2
    EASTER_WESTERN  = 3

    The default method is method 3.
    
    More about the algorithm may be found at:

    http://users.chariot.net.au/~gmarts/eastalg.htm

    and

    http://www.tondering.dk/claus/calendar.html

    """

    if not (1 <= method <= 3):
        raise ValueError, "invalid method"

    # g - Golden year - 1
    # c - Century
    # h - (23 - Epact) mod 30
    # i - Number of days from March 21 to Paschal Full Moon
    # j - Weekday for PFM (0=Sunday, etc)
    # p - Number of days from March 21 to Sunday on or before PFM
    #     (-6 to 28 methods 1 & 3, to 56 for method 2)
    # e - Extra days to add for method 2 (converting Julian
    #     date to Gregorian date)

    y = year
    g = y % 19
    e = 0
    if method < 3:
        # Old method
        i = (19*g+15)%30
        j = (y+y//4+i)%7
        if method == 2:
            # Extra dates to convert Julian to Gregorian date
            e = 10
            if y > 1600:
                e = e+y//100-16-(y//100-16)//4
    else:
        # New method
        c = y//100
        h = (c-c//4-(8*c+13)//25+19*g+15)%30
        i = h-(h//28)*(1-(h//28)*(29//(h+1))*((21-g)//11))
        j = (y+y//4+i+2-c+c//4)%7

    # p can be from -6 to 56 corresponding to dates 22 March to 23 May
    # (later dates apply to method 2, although 23 May never actually occurs)
    p = i-j+e
    d = 1+(p+27+(p+6)//40)%31
    m = 3+(p+26)//30
    return datetime.date(int(y),int(m),int(d))