from datetime import datetime as dt
from pytz import timezone as tz # pip install pytz

britian = ['GB']

american = [
    'America/Vancouver',
    'America/Toronto',
    'America/Los_Angeles',
    'America/New_York'
]

states = [
    'US/Pacific',
    'US/Mountain',
    'US/Central',
    'US/Eastern',
]

world = [
    'Asia/Seoul',
    'Hongkong',
    'Asia/Singapore'
]

def get_times(zones):
    time_list = list()
    time_tuple = tuple()
    for zn in zones:
        time_now = dt.now(tz=tz(zn)).replace(tzinfo=None)
        time_string = time_now.isoformat(sep=' ', timespec='minutes')
        zone = zn.rsplit('/', 1)
        time_tuple = time_string, zone[-1:][0]
        time_list.append(time_tuple)
    return time_list

print('Britain:')
for x in get_times(britian):
    print(x[0], ' - ', x[1])
print()

print('America:')
for x in get_times(american):
    print(x[0], ' - ', x[1])
print()

print('Major USA Time Zones:')
for x in get_times(states):
    print(x[0], ' - ', x[1])
print()

print('Global:')
for x in get_times(world):
    print(x[0], ' - ', x[1])