Time Zone Converter
Convert and compare a date-time string between any two time zones.
Paste an ISO 8601 formatted date, select the source and destination time zones, and instantly see the converted result.
This tool is useful for scheduling meetings across regions, verifying timestamps in logs or APIs, and checking time differences when working with global services.
The default comparison uses UTC and JST, but you can freely switch to any supported time zone.
All conversions are performed locally in your browser.
No date values are sent to any server, ensuring fast performance and privacy-safe usage.
How to use & features
- Type a date and time into either the UTC or JST field to update the paired value.
- Copy the converted result to coordinate releases or investigations across time zones.
- Edit seconds or milliseconds directly if finer precision is required.
- Everything runs locally with no data sent to a server.
Sample input & output
Convert UTC to JST
Input
2024-03-10 12:00 UTC
Output
2024-03-10 21:00 JST
Frequently asked questions
Can I choose the copy format?
Is there a quick “now” option?
Is daylight saving time considered?
Common use cases
Instant UTC↔JST conversion
Paste meeting times or log entries to see their counterparts in Japan time immediately.
Reviewing launch schedules
Compare release or batch times across zones to avoid configuration mistakes.
Support across timezones
Translate provided timestamps to JST to judge response windows and impact.
Notes & limitations
Work stays in your browser
Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.
Validate critical data
Results are helper outputs—double-check them before sending to production systems or sharing externally.
Large payloads depend on your device
Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.