About the Time Zone Converter
This time zone converter takes a date and time in one zone and shows the equivalent moment in another, reading the real UTC offset for each zone directly from your browser's own time zone database rather than a fixed, potentially outdated table. That means it correctly accounts for daylight saving transitions on both sides of the conversion, including cases where only one of the two zones observes it.
How to use the Time Zone Converter
- 1
Pick the date and enter the time in 24-hour HH:MM format.
- 2
Choose the zone that time is currently in under 'From'.
- 3
Choose the zone you want to convert it to under 'To'.
- 4
Read the converted time, plus the exact hour difference between the two zones on that date.
What people use it for
Scheduling a call across regions
Convert a proposed meeting time into every participant's local zone to avoid the classic mistake of a call landing at 3am for someone.
Working out when a livestream or release goes live
Convert an announced time from the organiser's zone into your own to know exactly when to be online.
Checking a flight's local arrival time
Convert a departure time in one zone against an arrival time in another to sanity-check a total journey duration shown in a booking.
How the offset is found for a specific date, not just a zone name
A time zone such as America/New_York does not have one fixed offset from UTC; it alternates between UTC-5 in winter and UTC-4 during daylight saving in summer, and the exact switch dates have themselves changed over the decades. Rather than hard-coding these rules, which drift out of date, this tool asks the browser's own Intl.DateTimeFormat API for the real offset at the exact date entered, using the IANA time zone database every modern browser ships with. This is the same underlying data operating systems and programming languages use, so the result matches what a calendar application would show.
Why a wall-clock time needs to be interpreted, not just read
Typing '15:00' means nothing on its own until you specify which zone's 3pm you mean, since the same clock reading refers to a completely different moment depending on where it is observed. This tool takes the wall-clock time you enter, interprets it specifically as belonging to the 'From' zone using that zone's real offset on the chosen date, and only then works out what the equivalent instant looks like on a clock in the 'To' zone — the two steps, interpreting and re-displaying, are genuinely distinct operations even though they happen in one click here.
Tips
- Fractional offsets, like India's UTC+5:30 or Nepal's UTC+5:45, are common and correctly handled — not every zone differs by a whole number of hours.
- Converting across a daylight saving transition date can shift the hour difference from what it is on a normal day, which is expected and correct.
- The UTC instant shown is timezone-independent, useful as an unambiguous reference when writing down a time for people in different zones.