10-digit timestamp
1Use this when your API returns Unix seconds.
1700000000
Timestamp Converter
Convert Unix timestamps and date-time values in real time with timezone-aware formatted output.
- Free to use
- No sign-in needed
- Seconds and milliseconds
- Local and UTC output
Timestamp conversion workspace
Convert Unix timestamps and date-time values, choose timezone and presets, then copy the exact output format you need.
Quick presets for common offsets
Timestamp → DateTime
Supports 10-digit seconds and 13-digit milliseconds.
Timestamp input
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Unix SecondsSeconds and milliseconds
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Unix MillisecondsSeconds and milliseconds
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ISO 8601UTC
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RFC 2822UTC
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YYYY-MM-DD HH:mm:ssBrowser Local
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Relative Time
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How to use
- Choose conversion mode: Timestamp → DateTime or DateTime → Timestamp.
- Paste your value, then pick timezone and presets when needed.
- Copy any output template (Unix seconds, milliseconds, ISO 8601, RFC 2822, or formatted date).
Quick examples
13-digit timestamp
2Use this when logs or clients return Unix milliseconds.
1700000000000
Date-time text input
3Convert plain date-time strings to Unix timestamp quickly.
2026-03-09 12:30:00
ISO 8601 input
4Convert ISO strings while checking timezone impact.
2026-03-09T12:30:00Z
Common timestamp errors
Using wrong timestamp length
10-digit values are seconds, 13-digit values are milliseconds. Mixing them shifts time dramatically.
Unexpected spaces or non-numeric characters
Timestamp input must be an integer. Remove spaces, commas, and other symbols before converting.
Unsupported date-time format
Use common formats such as YYYY-MM-DD HH:mm:ss or ISO 8601 to avoid parse failures.
Assuming timezone is fixed
The same timestamp renders differently under different timezones. Confirm timezone before sharing results.
Does this tool send data to a server?
Timestamp conversion and formatting run in your browser during normal use.
Input values are not sent to an external conversion API by this tool workflow.
Best use cases
API debugging
Verify created_at and updated_at fields when back-end responses use Unix timestamps.
Log analysis
Convert event timestamps into readable date-time values while investigating incidents.
Cross-timezone communication
Compare output under local, UTC, and Asia/Shanghai quickly before sharing schedules.
QA verification
Check whether front-end and back-end display the same moment across formats.
FAQ
How do I know whether input is seconds or milliseconds?
In most cases, 10 digits means seconds and 13 digits means milliseconds. This tool auto-detects both.
Why does the same timestamp look different in another timezone?
A Unix timestamp is absolute time. Displayed text changes by timezone, but the actual moment stays the same.
Can I convert negative timestamps?
Yes. Negative timestamps represent time before 1970-01-01 and are supported when valid.
Why does date-time input fail to parse?
Ensure your input follows common formats like YYYY-MM-DD HH:mm:ss or ISO 8601 without unsupported text.
Can I copy individual output formats?
Yes. Each output row has its own copy button so you can copy only the format you need.
Is this tool free for daily work?
Yes. It is designed for fast day-to-day timestamp checks without sign-in.
Timestamp scenarios
Unix Timestamp to Date
Convert 10-digit seconds or 13-digit milliseconds into readable local and UTC date-time values.
Date to Unix Timestamp
Convert readable date-time text into Unix seconds and milliseconds for APIs, logs, and database fields.
Milliseconds Timestamp Converter
Convert 13-digit millisecond timestamps and compare them with 10-digit Unix seconds to avoid unit mistakes.