# Date/time manipulation

import datetime

import time

epoch_year = datetime.datetime.utcfromtimestamp(0).year

def timestamp(datetime_): return time.mktime(datetime_.timetuple())

def strftime(format, datetime_):

    '''datetime.strftime() can't handle years before 1900'''

    return (datetime_.replace(year=epoch_year, day=1).strftime(

        format.replace('%Y', '%%Y').replace('%d', '%%d'))

        .replace('%Y', str(datetime_.year)).replace('%d', str(datetime_.day)))