is-thursday.py

#!/usr/bin/env python

import argparse
from datetime import datetime
from pytz import common_timezones, timezone

parser = argparse.ArgumentParser(description="Tells you if it's Thursday "
                                              "anywhere in the world.")
parser.add_argument('--all', action='store_true', default=False,
                    help='Print all timezones with Thursday.')

show_all = parser.parse_args().all
all_tzs = []

for tz in common_timezones:
    date = timezone('Europe/Warsaw').localize(datetime.now()).astimezone(timezone(tz))
    if date.weekday() == 3:
        if not show_all:
            print "YES, in %s!" % tz
            break
        else:
            all_tzs.append(tz)
else:
    if not all_tzs:
        print "NO!"
    else:
        print "YES, in:\n%s!" % "\n".join(all_tzs)