ez·time

── a quiet terminal for time math ──

timezones

one moment, side by side across the world

[reference time · UTC]
[ zones ]
  • UTC
    Thu, Apr 23, 21:22
    ○ awake
  • UTC
    Thu, Apr 23, 21:22
    ○ awake
  • America/New_York
    Thu, Apr 23, 17:22
    ● working
  • Europe/London
    Thu, Apr 23, 22:22
    · asleep
  • Asia/Tokyo
    Fri, Apr 24, 06:22
    ○ awake

── about this calculator ──

The timezone converter takes one moment in your local zone and shows the equivalent wall-clock time in every other zone you care about. It is the right tool for scheduling meetings with distributed teams, planning international calls with family, picking a launch window for a global product, watching live sports or esports, and figuring out when you actually need to be awake to catch a streamed event.

Behind the scenes, every conversion uses the IANA tz database that your browser already ships with, so daylight-saving transitions, half-hour and 45-minute offsets (looking at you, Nepal and the Chatham Islands), and recent political changes are all reflected. We do not depend on a static UTC offset table, which is why a meeting scheduled for the day after a spring-forward in one zone but not another still lands on the correct local time.

[ worked example ]
input › 2026-06-15 09:00 in America/New_York
output › Tokyo: Mon Jun 15, 22:00 · London: Mon Jun 15, 14:00

── frequently asked ──

› How does the timezone converter handle daylight-saving time?
We use the IANA timezone database (the same one your operating system uses) via the browser's Intl API. DST transitions are applied automatically based on the actual rules for each zone, not a static UTC offset.
› Why are there 'working / awake / asleep' tags?
A quick visual cue when planning meetings. Working = 09:00–17:59 in that zone; awake = 06:00–21:59; asleep = otherwise. They are heuristics, not promises about your colleague's calendar.
› Can I add a city that isn't in the dropdown?
The dropdown lists common zones, but the converter understands any IANA timezone identifier (e.g. America/Indiana/Indianapolis, Africa/Casablanca). We may add a free-text input in a future update.
› What's the difference between UTC and GMT?
For everyday purposes they're the same. UTC (Coordinated Universal Time) is the modern atomic-clock standard; GMT (Greenwich Mean Time) is a timezone that historically tracked the sun at the Greenwich meridian. They drift by less than a second, which doesn't matter for meeting scheduling.