timezones.py

from datetime import datetime
from pytz import timezone
import pytz
from dateutil.tz import *


# GLOBALS #

# left for future
date_format = {
    '24': '%d-%m %H:%M %Z',
    '12': '%d-%m %I:%M %p %Z'
}

zones = {
    'US/Central': timezone('US/Central'),
    'US/Eastern': timezone('US/Eastern'),
    'US/Pacific': timezone('US/Pacific'),
    'US/Mountain': timezone('US/Mountain'),
    'GMT': timezone('GMT'),
    'BST': timezone('Europe/London'),
    'Australia/Sydney': timezone('Australia/Sydney'),  # assuning this as AEST
    'Pacific/Auckland': timezone('Pacific/Auckland'),  # assuming this as NZTZ
}

# END GLOBALS #


class GetTimeZoneName:
    timezone = None
    country_code = None

    def __init__(self, timezone, country_code):
        self.country_code = country_code
        self.timezone = timezone

    def GetTimeZoneName(self):
        # see if it's already a valid time zone name
        if self.timezone in pytz.all_timezones:
            return self.timezone

        # if it's a number value, then use the Etc/GMT code
        try:
            offset = int(self.timezone)
            if offset > 0:
                offset = '+' + str(offset)
            else:
                offset = str(offset)
            return 'Etc/GMT' + offset
        except ValueError:
            pass

        # look up the abbreviation
        country_tzones = None
        try:
            country_tzones = pytz.country_timezones[self.country_code]
        except:
            pass

        set_zones = set()
        if country_tzones is not None and len(country_tzones) > 0:
            for name in country_tzones:
                tzone = pytz.timezone(name)
                for utcoffset, dstoffset, tzabbrev in getattr(tzone, '_transition_info',
                                                              [[None, None, datetime.datetime.now(tzone).tzname()]]):
                    if tzabbrev.upper() == self.timezone.upper():
                        set_zones.add(name)

            if len(set_zones) > 0:
                return min(set_zones, key=len)


class Top10TimeZones:
    target_date = None
    zone = None

    def __init__(self, target_date, zone):
        self.zone = zone
        self.target_date = target_date

    def start(self):
        parsed_date = datetime.strptime(self.target_date, '%m-%d-%Y %H:%M %p').replace(tzinfo=gettz(self.zone))\
            .astimezone(pytz.utc)

        print()

        print(f"UTC{'':17} {parsed_date.strftime(date_format['24'])}")

        for zonename, zone in zones.items():
            date = parsed_date.astimezone(zone)
            print(f"{zonename:<20} {date.strftime(date_format['12'])}")

#
# MAIN APP
#


while True:
    try:
        target = input("Provide datetime in MM-DD-YYYY HH:MM AM/PM format: ")
        datetime.strptime(target, '%m-%d-%Y %H:%M %p')
        break
    except:
        pass

get_zone = None
while get_zone is None:
    abbr = input("Provide time zone name, like UTC, AEDT: ")
    country = input('Provide two Letter Coutry Code, like UK, US, CZ: ')
    get_zone = GetTimeZoneName(abbr, country).GetTimeZoneName()

Top10TimeZones(target, get_zone).start()