Compare current local times across multiple cities and time zones. Automatic Daylight Saving Time adjustments — ideal for remote teams, travel planning, and international calls.
This tool displays live, ticking clocks for multiple cities simultaneously, using the browser's Intl.DateTimeFormat APIwith full IANA timezone database support. It handles DST transitions automatically — when clocks change in spring or autumn, the displayed times update without any user action. You can also use the time slider to set any hypothetical time and see what the equivalent local time is in every city you've added, making it the fastest way to find meeting overlap windows for global teams.
Remote and distributed teams are the most frequent users. When your engineering team is split between San Francisco, London, and Bangalore, finding a 30-minute overlap that falls during normal working hours for all three locations requires exactly this kind of side-by-side comparison. Adding all three cities instantly shows that 9:00 AM Pacific = 5:00 PM London = 10:30 PM Bangalore — which means there is no genuinely convenient overlap, but early-morning Pacific is the least disruptive for all parties.
Travelers and digital nomads use it to stay oriented while crossing time zones. Knowing what time it is back home while working from a different continent prevents the common mistake of calling family at 3 AM their time or missing an important meeting because of DST confusion.
Financial professionals use it to track market open and close times across exchanges — New York Stock Exchange (9:30 AM–4:00 PM ET), London Stock Exchange (8:00 AM–4:30 PM GMT), Tokyo Stock Exchange (9:00 AM–3:30 PM JST) — all at a glance.
International event planners coordinating conferences, webinars, or sports events with a global audience use it to select broadcast times that maximize participation across target regions.
The world is divided into 24 primary time zones, each offset from UTC by a whole or half-hour increment. However, with national and political adjustments, there are currently 38 distinct UTC offsets in use globally — including unusual ones like UTC+5:45 (Nepal) and UTC+5:30 (India). The IANA Time Zone Database (also called the Olson database) catalogs all named timezone regions with their complete history of offset changes, DST rules, and transitions.
Modern browsers implement the IANA database natively through the Intl JavaScript API. When you call new Intl.DateTimeFormat('en-US', {timeZone:'America/New_York'}).format(new Date()), the browser applies the correct EST/EDT offset depending on the current date. This is why named timezones always handle DST correctly — the rules are built into the database, not calculated manually.
DST transition accuracy: The tool relies on the browser's built-in IANA database, which may not reflect very recent political timezone changes (some countries change their timezone rules with short notice). For extremely time-sensitive legal or financial purposes, verify with the country's official timekeeping authority.
Browser clock accuracy: The displayed time is sourced from your device's system clock. If your device clock is incorrect (drifted or not NTP-synced), the times shown will be incorrect by the same margin.
Leap seconds: The IANA database does not explicitly handle leap seconds (rare UTC adjustments for Earth's rotation variance). For scientific or astronomical precision requiring leap-second accuracy, consult USNO or BIPM directly.
Confused by UTC offsets, DST, and timezone abbreviations? Read our plain-English explainer.
World Time Zones Explained: DST, UTC & Offsets →