ToolKitNexus
Time & Date

Time Zone Converter

Convert a date and time between any two IANA time zones, with automatic daylight-saving handling.

A time zone converter translates a wall-clock date and time in one region into the equivalent moment in another. This tool uses the browser’s built-in IANA time zone database (via the Intl API), so it accounts for each zone’s current UTC offset and daylight-saving rules automatically. All conversion happens locally — no data leaves your device.

How to use

  1. Enter a date, time and the source time zone.
  2. Pick the target time zone (use swap to reverse).
  3. Read the converted time, date and GMT offset below.

FAQ

How does the converter handle daylight saving time?

It reads each zone’s offset for the exact date you enter from the browser’s IANA time zone data, so spring-forward and fall-back transitions are applied automatically. Converting a summer date and a winter date between the same two zones can therefore give different hour differences.

What is an IANA time zone?

IANA time zones are the standard identifiers like America/New_York or Asia/Tokyo maintained in the tz database. They encode a region’s full history of UTC offsets and DST rules, which is why they are more reliable than fixed abbreviations such as EST or PST.

What does the GMT offset shown mean?

It is the target zone’s difference from Coordinated Universal Time at the converted moment, written as GMT±HH:MM. For example GMT+09:00 means the zone is nine hours ahead of UTC on that date.

Is my data sent to a server?

No. The conversion runs entirely in your browser using the Intl API. It works offline.