Print world clock in terminal

tz.py

#!/usr/bin/env python3
# Print world clock in terminal
# (c) Copyright 2022 by Joseph Reagle
# Licensed under the GPLv3, see <http://www.gnu.org/licenses/gpl-3.0.html>
#
# replacing: https://superuser.com/questions/164339/timezone-conversion-by-command-line

import argparse  # http://docs.python.org/dev/library/argparse.html
import sys

import pendulum  # https://pendulum.eustace.io/docs/

my_tz = "America/New_York"
my_start = pendulum.parse("8:00", tz=my_tz)  # start of day in 24 HH
my_end = pendulum.parse("18:00", tz=my_tz)  # end of day in 24 HH

arg_parser = argparse.ArgumentParser(description="Print world clock in terminal")
arg_parser.add_argument("time", nargs="?", metavar="TIME", help="target time to show")
args = arg_parser.parse_args(sys.argv[1:])
if args.time:
    args.time = pendulum.parse(args.time, tz=my_tz)
else:
    args.time = pendulum.now(my_tz)

# zones of interest
target_zones = [
    "Asia/Calcutta",
    "Etc/UTC",
    "Europe/London",
    "America/New_York",
    "America/Chicago",
    "America/Denver",
    "America/Los_Angeles",
]

for zone in target_zones:
    zone_time = args.time.in_timezone(zone)

    highlight = "\033[4m" if zone == my_tz else "\033[0m"
    print(
        f"{highlight}{zone:<20} {zone_time.strftime('%b-%d')}"
        + f" {zone_time.strftime('%H:%M%p | %z')}",
        end=" || ",
    )

    counter = my_start
    while counter <= my_end:
        counter_in_tz = counter.in_timezone(zone)
        print(f"{counter_in_tz.format('HH')} ", end="")
        counter = counter.add(hours=1)

    print()