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Timestamp Converter
About This Tool
Timestamp Converter is a completely free online timestamp converter supporting bidirectional conversion between timestamps and date time. It includes 14 common time zones such as Beijing, New York, London and Tokyo, plus 15 output formats, with automatic detection of second- and millisecond-level timestamps. Everything is computed locally in your browser for privacy and security.
How to Use
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Enter timestamp
Paste the timestamp into the input box on the left. Second-level (10 digits) and millisecond-level (13 digits) values are detected automatically.
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Choose settings
Pick the time zone and output format as needed, such as Beijing Time, ISO 8601 or a custom date format.
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Convert
Click the Convert button to get the result. The right side converts date time back into second- and millisecond-level timestamps.
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Copy result
Click the copy icon next to the result box to copy it instantly for use in code, logs or documents.
Use Cases
- Development: turn timestamps in API responses into readable time, or convert date time back to a timestamp for your code.
- Log analysis: decode timestamps in server logs and pin down when an issue happened across time zones.
- Cross-timezone collaboration: convert times to the other party's time zone when working with overseas colleagues.
Key Advantages
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Completely free
No limits on conversions, no registration needed, all features available as soon as the page opens.
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Bidirectional conversion
Convert timestamps to date time and back, with automatic detection of seconds and milliseconds.
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Many time zones
14 common time zones including Beijing, New York, London and Tokyo make cross-timezone conversion easy.
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Rich formats
15 common date formats plus ISO 8601 output cover a wide range of needs.
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Local computation
All conversions run locally in your browser and no data is uploaded, so sensitive time data stays safe.
Timestamp Unit Reference
The same moment corresponds to different timestamp values at different precisions. Common units are compared below:
| Unit | Example value | Description |
|---|---|---|
| Second | 1751856000 | 10 digits, most common in programming |
| Millisecond | 1751856000000 | 13 digits, common in frontend and Java |
| Microsecond | 1751856000000000 | 16 digits, used in high-performance scenarios |
FAQ
A timestamp converter is an online tool for converting between Unix timestamps and date time, with multi-timezone and multi-format output. It is a handy helper for developers working with time data.
Second-level timestamps are usually 10 digits and millisecond-level ones are 13 digits. This tool detects the length automatically, so just paste and convert.
14 common zones are built in: Beijing, UTC, New York, Los Angeles, London, Paris, Tokyo, Seoul, Singapore, India, Sydney, Auckland, Brazil and Cairo, covering major business regions.
15 common date formats such as yyyy-MM-dd HH:mm:ss, ISO 8601 and RFC 1123 are supported, along with second- or millisecond-level timestamp output.
Yes, very accurate. Conversion runs locally in your browser, following the selected time zone and format exactly, consistent with server-side calculation.
No registration, completely free. Open the page and use it with no limits on conversions and no software to install.
No. Everything is converted locally in your browser, and your timestamps and date times are never uploaded.
Yes. The page adapts to phone browsers with full input, conversion and copy features for time conversion on the go.
Command line tools require memorizing commands and format arguments. The online tool offers visual time zone and format selection, opens instantly and supports copying results, with a lower barrier to use.
Check the digit length of the timestamp, whether the time zone is correct, and whether the date time format matches the hint. Second- and millisecond-level inputs correspond to different values.
Yes. Times before January 1, 1970 correspond to negative timestamps, and the tool converts them correctly.
The current version converts one timestamp at a time for speed. For batch processing, spreadsheet functions are a better fit; this tool is ideal for everyday quick conversions.
Content last updated：2026-07-10
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