Time Zone Converter
The Time Zone Converter converts any date and time from one time zone to another, automatically accounting for daylight saving time using your browser's built-in time zone database. Internally, the converter resolves your entered local date and time to an exact UTC instant using a two-pass lookup: it first assumes the source zone's offset for that calendar date, computes a candidate UTC instant, then re-checks the offset at that specific instant and corrects for it — this is what lets it land on the right side of a DST transition even when your chosen date falls right at the boundary. Because the U.S. starts and ends daylight saving time on different calendar dates than the UK and EU (the U.S. shifts on the second Sunday of March and first Sunday of November; the UK/EU shift on the last Sunday of March and October), there are multi-week windows each spring and fall — for example, March 8–28, 2026 for New York vs. London — where the usual gap between two cities temporarily shrinks or grows by an hour, and the tool reflects that automatically rather than assuming a fixed offset. Offsets are tracked in minutes rather than whole hours, so half-hour-offset zones like Mumbai/New Delhi (UTC+5:30) display correctly instead of rounding to the nearest hour.
How This Tool Works
Choose a date and time, select the source time zone, and select the target time zone to see the converted local time instantly.
Formula & Method
We use the Intl.DateTimeFormat API with the IANA time zone database (built into your browser) to correctly resolve UTC offsets, including daylight saving time transitions, for any date.
Example Calculation
Convert 3:00 PM (15:00) on March 15, 2026 from New York to London. At that date, the U.S. has already sprung forward — DST began March 8, 2026 — but the UK hasn't yet, since BST doesn't start until March 29, 2026. So New York is on Eastern Daylight Time (UTC−4) while London is still on GMT (UTC+0): a temporary 4-hour gap instead of the usual 5. The tool converts 15:00 EDT to 19:00 UTC (15:00 + 4 hours), then reads that same UTC instant in London's zone: 19:00 + 0 = 19:00. The result panel shows "19:00 on 2026-03-15" — 7:00 PM in 24-hour format — with a source offset of UTC-4 and a target offset of UTC+0. Three weeks later, once BST begins on March 29, that same 3:00 PM New York time would convert to 20:00 (8:00 PM) London instead, since both zones would then be shifted together (EDT UTC−4, BST UTC+1 — a 5-hour gap).
Frequently Asked Questions
Does this account for daylight saving time?+
Yes — conversions use your browser's built-in IANA time zone database, which automatically applies the correct daylight saving rules for any given date.
Why do some conversions cross into the next or previous day?+
Large time zone differences can push the converted time past midnight, so the result may land on the day before or after your original date — the calculator labels this clearly.
Can I convert between any two cities?+
Yes, choose any two zones from the list to convert between them — the list covers major time zones representing most regions of the world.
Why might the time difference between two cities change by an hour depending on the date I pick?+
Because the U.S. and the UK/EU switch to daylight saving time on different calendar dates, there are windows of a few weeks each spring and fall — for example, March 8–28, 2026, when the U.S. has sprung forward but the UK hasn't yet — where the usual gap between two zones temporarily shrinks or grows by an hour. The converter looks up the real offset for your exact date rather than assuming a fixed difference, so it reflects this automatically.
Does the converter handle time zones with a 30-minute offset, like India?+
Yes — offsets are calculated and displayed in minutes rather than whole hours, so Mumbai/New Delhi (Asia/Kolkata) correctly shows as UTC+5:30 rather than being rounded to UTC+5 or UTC+6.
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<a href="https://everyfix.net/tools/time-zone-converter/">Time Zone Converter</a> by <a href="https://everyfix.net">EveryFix</a>Related Tools
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