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Date & Time • Time Zone Calculator

Time Zone Calculator

Convert and compare times across global world time zones and cities, interactive UTC time slider, meeting planner for distributed teams, and DST offsets.

World Clock & Meeting Synchronizer

Time Zone Calculator

Compare local times across global cities, scrub a 24-hour visual slider, and identify optimal international meeting windows.

Universal Coordinated Time (UTC)
14:00 UTC / GMT
00:0004:0008:0012:0016:0020:0023:00
Best Recommended Meeting Windows:

Selected Time Zones (5)

New York

United States • UTC-4
10:00 AM
Same Day
● Business Hours (9am-5pm)10:00

London

United Kingdom • UTC+1
3:00 PM
Same Day
● Business Hours (9am-5pm)15:00

Tokyo

Japan • UTC+9
11:00 PM
Same Day
○ Sleeping Hours23:00

San Francisco

United States • UTC-7
7:00 AM
Same Day
◐ Waking Hours07:00

Singapore

Singapore • UTC+8
10:00 PM
Same Day
○ Sleeping Hours22:00
Working Hours (9:00 AM – 5:00 PM)
Awake / Evening (7-9 AM, 5-10 PM)
Sleeping (10:00 PM – 7:00 AM)
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Calculation Guide & Reference

Global Timezone Coordinates, UTC Offsets & Meeting Planning

Compare time across world cities with an interactive 24-hour visual scrubber slider. Find overlapping international meeting windows with daylight saving time support.

Standardized Mathematical Formula
Local_Time = UTC_Time + UTC_Offset (± Daylight Saving Time Adjustment)

Calculates the exact local clock time for any city worldwide by applying positive or negative hour offsets relative to Coordinated Universal Time (UTC/GMT).

Variables:
UTC_Time:Coordinated Universal Time standard reference
UTC_Offset:Time difference from prime meridian (-12 to +14 hours)
DST:Daylight Saving Time seasonal +1 hour shift
How It Works (Step-by-Step)
  • 1Scrub the 24-hour visual slider to change the time across all cities simultaneously.
  • 2View color-coded status for each city: Green (Working hours 9am-5pm), Yellow (Awake 7-9am / 5-10pm), and Dark (Sleeping 10pm-7am).
  • 3Add or remove global cities from our database of 30+ major financial and cultural hubs.
  • 4Check recommended overlapping meeting windows where all participants are awake.
  • 5Click "Copy Schedule" to generate a meeting invite with converted local times for all attendees.
Real-World Numerical Example
Planning a Meeting between New York, London, and Tokyo

Finding a meeting time for teams in NYC (UTC-4), London (UTC+1), and Tokyo (UTC+9).

•At 13:00 UTC:
•• New York: 9:00 AM (Start of business day - Green).
•• London: 2:00 PM (Middle of business day - Green).
•• Tokyo: 10:00 PM (End of evening - Awake/Yellow).
•13:00 UTC is the optimal window allowing all 3 timezones to participate without waking anyone at night.
Result: Best meeting time: 13:00 UTC (9:00 AM New York / 2:00 PM London / 10:00 PM Tokyo).

Frequently Asked Questions (FAQ)

UTC stands for Coordinated Universal Time, the primary time standard by which the world regulates clocks and time.

Use the overlapping meeting window recommendations on the calculator to find times where all participants are within green (9am-5pm) or yellow (7am-10pm) hours.

Yes, each city's offset from UTC accounts for whether that region currently observes Daylight Saving Time, so converted times stay accurate as clocks shift in spring and fall.

Yes, add as many cities as you need from the database of 30+ major hubs — all selected cities update together as you scrub the 24-hour time slider.

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