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Open toolTime Zone Converter
Convert an explicit instant to an IANA time zone with daylight-saving rules.
Maximum 200,000 characters. Input is not stored.
Ready. Use Ctrl/⌘ + Enter to run.
Completed and failed run counts are stored only on this device.
How to use this tool
Enter an ISO timestamp with Z or explicit offset, choose an IANA zone such as Asia/Shanghai, and run. The UTC instant and local display are both shown.
Supported input and limits
Naive local times are rejected to avoid DST ambiguity. Uses the browser's current time-zone database; future legal changes can affect projections. UTC seconds must be 0–59.
Frequently asked questions
Can I convert 01:30 without an offset?
No. Such a local time may occur twice or not at all around DST changes. Supply a known UTC instant or explicit offset.
Is my input uploaded?
No. Processing happens in a disposable worker on your device. Only local success/failure counts are saved; input is never stored.
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