The World Clock
Meeting Planner
for global teams
Scheduling across time zones is hard. Daylight saving shifts move without warning, the date line turns Monday into Tuesday, and no single hour works for everyone. This world clock meeting planner gives you live clocks for every major city, a 90-day DST watch list, scheduling etiquette, and a complete timezone reference — all in one place, with no fluff.
Team timezone planner
World Clock Meeting Planner
Everything you need to work confidently across time zones — live clocks, DST tracking, scheduling etiquette, and a complete reference.
Right now, around the world
Current local time in major business hubs. Updates every second.
DST watch list — next 90 days
Daylight saving transitions silently shift overlap windows. Here's what's coming.
The International Date Line — why Sunday in LA is Monday in Sydney
The single most confusing fact about global scheduling.
What it is
The International Date Line runs roughly along the 180° meridian in the Pacific Ocean. Cross it heading west and you gain a day. Cross it heading east and you lose one. It's why a flight from Los Angeles to Sydney can depart on a Sunday and arrive on a Tuesday — even though the flight takes around 15 hours.
Why it matters for scheduling
When it's 9am Monday in New York, it's already 11pm Monday in Sydney — and midnight Tuesday in Auckland. Any recurring meeting that sits in the evening for a US team is landing in the early hours of the following calendar day for Oceania. "Monday's meeting" isn't Monday for everyone. Always verify the date, not just the time.
UTC vs GMT — what's the actual difference?
Both terms appear on meeting invites, developer docs, and flight boards — often interchangeably. For everyday scheduling they represent the same zero-offset point in time. But the distinction matters when precision counts.
GMT (Greenwich Mean Time) is a time zone — specifically the local time at the Royal Observatory in Greenwich, London, adopted as the international standard in 1884. Because it's based on the Earth's rotation, which is not perfectly consistent, it was eventually superseded as a scientific standard.
UTC (Coordinated Universal Time) is not a time zone — it's an atomic time standard maintained by a network of atomic clocks worldwide. It replaced GMT as the global timekeeping reference because it is far more precise. UTC never observes daylight saving time.
When you see UTC+5:30 (India) or UTC−5:00 (Eastern Standard Time), that number is the offset from UTC. Every timezone on Earth is defined as UTC plus or minus some amount. UTC itself is always UTC±00:00.
Which countries observe daylight saving?
Around 70 countries use DST. The rest — including some of the world's most populous nations — don't. This catches teams out constantly.
Timezone etiquette for global teams
Small habits that prevent missed meetings, off-by-one-hour errors, and 3am wake-ups.
Common questions
The questions that bring people to timezone tools in the first place.
Timezone terminology
Every term you'll encounter when working across time zones.
Accuracy note. Governments occasionally change DST rules with short notice. Always verify scheduling dates close to a DST transition window.
Related tools & reading
More from moonphase.today and one authoritative external reference.
Daylight Saving Time 2026
Exact dates, how the clock changes work, and which states and countries opt out.
UTC Time Conversion & Zulu Time
Live UTC clock, conversion tools, and a plain-English guide to Zulu time used in aviation.
Astronomy Calendar
Every notable sky event for the year — eclipses, meteor showers, planetary conjunctions, and more.
IANA Time Zone Database
The authoritative source for all timezone rules worldwide — the data behind every operating system and browser clock.