Exercise 1 solution

    from datetime import datetime, timezone
    from zoneinfo import ZoneInfo

    def world_clock(moment, names):
        for name in names:
            local = moment.astimezone(ZoneInfo(name))
            print(f"{name:<20} {local:%Y-%m-%d %H:%M} {local.tzname():<5} offset {local.utcoffset().total_seconds() / 3600:+.2f}")

    moment = datetime(2026, 11, 20, 23, 30, tzinfo=timezone.utc)
    world_clock(moment, ["Europe/London", "Asia/Kolkata", "Pacific/Auckland", "America/Los_Angeles"])

Output (run, and exactly as shown):

    Europe/London        2026-11-20 23:30 GMT   offset +0.00
    Asia/Kolkata         2026-11-21 05:00 IST   offset +5.50
    Pacific/Auckland     2026-11-21 12:30 NZDT  offset +13.00
    America/Los_Angeles  2026-11-20 15:30 PST   offset -8.00

Explanation: astimezone keeps the moment and rewrites the reading for each
zone, so all four lines are the same instant. Three of the four are on a
different calendar date from the UTC value or from each other, which is why a
date shown to users should always be converted first. The offsets are not
whole hours everywhere (+5.5), and the abbreviation and offset for a zone
depend on the date: Auckland is on +13 here because it is in its summer.