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Timezone Converter

Enter a wall-clock date and time in one zone to see the same instant in another, plus how the offsets compare.

Next step: Date Format Converter

When to use this calculator

Use this calculator whenever you need to find what time it is in another time zone for a given moment—scheduling a meeting across regions, converting a travel itinerary, or checking an offset difference.

  • Scheduling across regions

    Find the local time in another zone for a proposed meeting or call time.

  • Travel itinerary conversion

    Convert a flight departure or arrival time from one zone to another.

  • Offset comparison

    Check how many hours ahead or behind two zones are at a specific date, accounting for daylight saving.

  • UTC and format conversion instead

    For converting a single instant into ISO, UTC-readable, or Unix timestamp formats, use the Date Format Converter.

Inputs

  • Date and time

    The wall-clock date and time in the source zone.

  • From time zone

    The source IANA time zone the date and time represent.

  • To time zone

    The target IANA time zone to convert into.

How the calculation works

The date and time you enter are treated as local civil time in the source zone—not UTC. The tool finds the UTC instant with the Intl API, then formats it in the target zone.

Offset difference is how far the target zone is ahead of or behind the source zone at that moment (accounting for daylight saving when applicable). Only common IANA zones from the lists are supported; no external libraries are used.

Worked example

Date and time: 14 July 2025, 9:00 AM. From: Eastern Time (US & Canada). To: Tokyo.

Converted time: 14 July 2025, 10:00 PM in Tokyo (same calendar day, since Tokyo is 13 hours ahead of Eastern Time during Eastern Daylight Time).

The same source time converted to London instead is 14 July 2025, 2:00 PM (5 hours ahead of Eastern Time in July, when both London and New York observe daylight/summer time).

Edge cases

  • Daylight saving time transitions

    Converting a date near a daylight saving change can produce an offset different from the same source/target pair on another date—the calculator always uses the offset actually in effect on the entered date.

  • Date rollover

    Converting a late-evening time in one zone to a zone many hours ahead can land on the next calendar day in the target zone—as in the worked example, where 9:00 AM Eastern becomes 10:00 PM the same evening in Tokyo.

  • Zones without daylight saving

    Some zones (such as most of Asia) don't observe daylight saving, so their offset from UTC stays constant year-round even as the offset from a daylight-saving zone shifts seasonally.

Related Date & Business Days Calculators

The Business Days vs Calendar Days Guide explains when weekends and holidays count and which day type applies to deadlines, invoices, and contracts.

The How Business Days Are Calculated Guide and Business Days Between Dates Guide cover the counting rules behind every business-day tool on this site.

The Business Days Calculator and Working Days Calculator count weekdays between two known dates, excluding weekends and optional US federal holidays.

The Add Business Days To Date, Subtract Business Days From Date, and Business Day Offset calculators move a single date forward or backward by a business-day count.

The Business Days Until Date Calculator counts business days remaining from today or a custom date to a target deadline.

The Days Between Dates Calculator counts every calendar day between two dates, including weekends—use it instead of the business-day tools when weekends should count.

The Date Range Calculator and Date Duration Calculator break a range into calendar-day totals or a years/months/days breakdown, with inclusive or exclusive boundary options.

The Add or Subtract Days Calculator shifts a single date forward or backward by days, weeks, or months.

The Age Calculator applies the same calendar breakdown used by Date Duration to a birth date, expressed as years, months, and days.

The Hours Between Dates and Date Difference calculators measure elapsed time between two date-times down to hours, minutes, and seconds.

The Date Format Converter, Unix Timestamp Converter, and Timezone Converter handle format and zone conversion for a single instant rather than a span between two dates.

FAQ

Is the entered time treated as UTC?
No. The date and time you enter are treated as local civil time in the "From" zone you select, not UTC. The calculator converts from that local time to the target zone.
Does this account for daylight saving time?
Yes. The offset used is whatever is actually in effect for the specific date entered, so results correctly reflect daylight saving transitions where applicable.
Why isn't my time zone in the list?
Only a set of common IANA time zones is supported. If your specific zone isn't listed, use the closest zone with the same current offset, or the Date Format Converter for UTC-based conversion.
How is this different from the Date Format Converter?
This calculator converts a wall-clock time between two named time zones. The Date Format Converter starts from a UTC date and time and shows it in several formats, including your browser's local zone.

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