Loading…
Convert times across zones and find meeting-friendly hours.
🌍 Offsets and daylight-saving rules come from your browser's built-in Intl database — no data leaves your device. Rows tinted green are inside local business hours (9:00–17:00); a day-shift badge appears when the converted date differs from the source date.
Scheduling across timezones is where good meetings go to die. This timezone converter turns a local date and time into the equivalent wall-clock time in up to six other zones at once — with UTC offsets, day-shift warnings, and a business-hours heat map so you can spot a humane meeting slot at a glance. It runs entirely in your browser on the built-in Intl API, so nothing you enter ever leaves your device.
The time you enter is interpreted as wall-clock time in the source zone, converted to an absolute instant, and then rendered in each target zone with the correct offset — including daylight saving time. Because DST is applied by the browser's own timezone database, a meeting in March and the same meeting in November can land on different UTC offsets for zones like New York or London. The UTC offset column shows the offset in effect at that exact moment, not a yearly average.
Rows tinted green fall inside local business hours (9:00–17:00) — aim for slots where every row is green. A day-shift badge(+1 day / -1 day) appears when the converted time lands on a different calendar date than the source; this is the classic source of "wait, your Tuesday or my Tuesday?" confusion with Asia-Pacific teammates. The hour bars below the table give a visual 0–23 hour strip per zone, with the selected hour marked in blue.
"My local zone" is detected from your device settings, so double-check it if you travel or use a VPN-adjusted system clock. Remember that the input is always read in the source zone — pressing Nowfills in the current time as seen in that zone, which may differ from your own clock. Around DST switchover weekends, a given wall time can be ambiguous or nonexistent in the affected zone; the converter resolves it to the closest valid instant, but it's worth confirming critical events for those dates with participants directly.
The Timezone Converter converts timezone converterfrom one unit to another using the exact internationally defined conversion factors. Type a value, choose your source and target units, and the converted result is shown instantly — no waiting, no page reload.
Manual conversion is error-prone because it means memorizing ratios (how many feet in a meter, how many pints in a liter). This tool removes that friction: the conversion factor is built in, and the math is done to full precision with no rounding until the final displayed number.
Common uses: people reach for this tool when they need to look up a meeting planner across time zones, convert est to pst to utc, time difference calculator between cities, or best time for meeting across timezones.
Browser-based tools like this one have a few real advantages over installed software or manual methods:
The Timezone Converter is based on the following formula:
local time = UTC + offset
Variables: UTC: Coordinated Universal Time offset: the zone offset in hours, written +hh:mm or −hh:mm (may shift with daylight saving) local time: wall-clock time in the target zone
Every time zone is UTC plus a fixed offset (which may shift with daylight saving). Converting between zones goes through UTC: add one offset, subtract the other.
Worked example: Step 1: An event happens at 14:00 UTC. Step 2: New York in winter uses UTC−5. Step 3: 14:00 − 5 = 09:00 local time. Result: 09:00 EST in New York (it becomes 10:00 EDT in summer).
More tools you might find useful