User Guide

Online Time Zone Converter — UTC and World Time

Convert dates and times online between any two time zones, including UTC, for server logs and everyday work.

How to use

1. The defaults are UTC → device time zone and device time zone → UTC. Select the source and target time zones independently in each row.
2. Enter a date and time in the selected source zone to convert automatically to the target zone. You can also convert between regional zones without selecting UTC.
3. Results update while typing. Copy the converted value using its copy icon.

Input and output example

2026-10-04T09:49:50Z

2026-10-04 05:49:50 America/New_York

2026-10-04 05:49:50

2026-10-04 09:49:50 UTC

Background knowledge

UTC / Z

UTC is a reference for comparing times. Z at the end of an ISO timestamp means UTC. KST is UTC+09:00, so 09:49 UTC and 18:49 KST describe the same instant. Crossing midnight also changes the date.

Time zone

A name such as Asia/Seoul identifies regional time-zone rules. A numeric offset is the difference from UTC at a particular instant. Where daylight saving applies, this difference changes with the date; a fixed addition or subtraction is not always correct.

Notes

• Dates use year-month-day order. Without a zone marker, the selected source zone applies. Explicit Z, UTC, GMT, KST or numeric offsets take priority.
• Nonexistent or repeated local times during daylight saving transitions need attention. For repeated times, include a numeric UTC offset to identify the intended instant.
• The example time zone is illustrative. The tool initially uses your device’s time zone.
• Both time inputs accept ISO UTC, such as 2026-10-04T09:49:50Z, or just a time such as 09:49:50. Other formats are recognized automatically. With time only, today’s date in the source zone and daylight saving rules apply.

Frequently asked questions

What can I use this online tool for?

Convert dates and times online between any two time zones, including UTC, for server logs and everyday work.

Can I convert between time zones other than UTC?

Yes. For example, select Asia/Seoul as the source and America/New_York as the target. Each row is independent, and daylight saving rules apply for the entered date.

Can I enter only 09:49:50 without a date?

Yes. The source zone’s current date is used, and crossing midnight is indicated. Repeated local times at daylight saving transitions need an offset such as +02:00 to identify the intended instant.

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