NameError: name 'timezone' is not defined. Please explain why?

from datetime import datetime import pytz

pytz.all_timezones

other_timezones = [ pytz.timezone("US/Eastern"), pytz.timezone("Pacific/Auckland"), pytz.timezone("Asia/Calcutta"), pytz.timezone("UTC"), pytz.timezone("Europe/Bucharest"), pytz.timezone("Europe/Paris"), pytz.timezone("Europe/London"), pytz.timezone("Europe/Madrid"), pytz.timezone("Europe/Moscow"), pytz.timezone("Europe/Stockholm") ]

fmt = "%Y-%m-%d %H:%M:%S %Z%z"

while True: date_input = input("When is your meeting? Please use MM/DD/YYYY HH:MM format. ") try: local_date = datetime.strptime(date_input, "%m/%d/%Y %H:%M") except ValueError: print ("{} doesn't seems to be correct format. Please try again" .format(date_input)) else: local_date = pytz.timezone("Europe/Kiev").localize(local_date) utc_date = local_date.astimezone(pytz.utc)

    output = []
    for i in other_timezones:
        output.append(utc_date.astimezone(timezone))
    for y in output:
        print(y.strftime(fmt))
    break