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World Clock & Meeting Planner

Side-by-side clocks for cities worldwide. Plan meetings across time zones with live work-hours indicators.

Date & Time

World Clock & Meeting Planner

Generated on April 25, 2026

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?What is the World Clock & Meeting Planner?

The World Clock & Meeting Planner shows the current time in multiple cities side-by-side, with visual day/night indicators and a live tag for whether each city is in standard work hours (9 AM – 6 PM local time). Pin your most-frequently-needed cities and the list is saved to your device. Switch into 'Plan a meeting' mode to type a specific time in one city's zone — every other clock then shows what that moment looks like locally, so you can find a slot that works for everyone. Built on the IANA time-zone database (via the browser's `Intl` API), so it correctly handles daylight-saving transitions worldwide.

The Formula

Local time in zone Z = UTC + UTC-offset(Z, date). Each zone's offset varies through the year if it observes DST.

The IANA time-zone database is the world's authoritative source for time-zone definitions, maintained at iana.org/time-zones. Each zone (like 'Asia/Karachi' or 'Europe/London') has a complete history of UTC offsets and DST transitions. Browsers ship this database and expose it via `Intl.DateTimeFormat`, which is what this clock uses — so the times are accurate to the second. Pakistan does NOT observe DST (UTC+5 year-round). Most of Europe, North America, and Australia observe DST with different start/end dates. Some unusual zones: India (UTC+5:30), Nepal (UTC+5:45), Newfoundland (UTC−3:30), parts of Iran (UTC+3:30, +4:30 with DST).

Practical Examples

1

Karachi (UTC+5) is 9 hours ahead of New York (UTC−4 in summer / −5 in winter). A 9 AM Karachi meeting = midnight or 1 AM in New York.

2

London (UTC+0/+1) is 4-5 hours ahead of New York and 4-5 hours behind Karachi. Often the best meeting time for PK ↔ US teams: 5-6 PM Karachi = 1-2 PM London = 8-9 AM New York.

3

Dubai (UTC+4) is 1 hour behind Karachi, so PK ↔ UAE meetings are usually easy.

4

India ↔ Pakistan: India is 30 minutes AHEAD of Pakistan (IST = UTC+5:30 vs PKT = UTC+5).

5

Australia is split into 3 zones (Sydney UTC+10/+11, Brisbane +10 no DST, Perth +8). The Australian east coast is 5 hours ahead of Karachi.

6

Working with Tokyo (UTC+9) from Karachi (UTC+5): 4-hour gap. 9 AM Karachi = 1 PM Tokyo.

Frequently Asked Questions

Yes. The browser uses the IANA time-zone database, which knows the exact start/end dates of DST for every zone in every year. Pakistan never observes DST; most of Europe, North America, and Australia do.

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