ww.py

#!/usr/bin/env python
#
# ww -- calculate the current Intel work week (which is slightly different than ISO week)
#

import datetime

def ww(d):

    # find first day of ww 1 by finding Jan 1 of
    # d's year and back up to the Sunday for that week
    first = datetime.date(d.year, 1, 1)
    first = first - datetime.timedelta(days = (first.weekday() + 1) % 7)

    # similarly, find the first day of the next year's ww 1
    nxt = datetime.date(d.year + 1, 1, 1)
    nxt = nxt - datetime.timedelta(days = (nxt.weekday() + 1) % 7)

    # the work week is now calculated by counting the
    # number of weeks that passed since "first", except
    # near the end of the year when we might run into
    # ww 1 of next year, so we check for that first
    if d >= nxt:
        return 1

    # the work week is the number of weeks
    # that have passed since "first".  we add one since the
    # first ww is ww 1 not ww 0.
    delta = d - first
    return delta.days / 7 + 1


def testww():

    d = datetime.date(2008, 11, 20)
    enddate = datetime.date(2013, 2, 2)
    delta = datetime.timedelta(days = 1)
    while d <= enddate:
        print d.strftime("%Y-%m-%d"), ww(d)
        d += delta

if __name__ == '__main__':
    print ww(datetime.date.today())