What is a Unix timestamp?
A Unix timestamp is the number of seconds elapsed since 1 January 1970 at 00:00:00 UTC. Millisecond timestamps use the same starting point but count milliseconds instead.
Tools
Timestamp Converter
Convert Unix seconds or milliseconds to local and UTC dates, or convert a local date back to both units.
Current offset: UTC+00:00
Timestamp to date
Convert Unix seconds or milliseconds into readable dates.
Date to timestamp
Interpret a date and time in the selected timezone.
Selected timezone: UTC (UTC+00:00)
A Unix timestamp counts the seconds elapsed since 1 January 1970 at 00:00:00 UTC. The same timestamp represents one instant worldwide; only its displayed date and time change by timezone. This converter accepts Unix seconds or milliseconds and converts a date in the selected timezone back to both units.
How to use the timestamp converter
- 1Choose the browser, UTC, Hong Kong or Shanghai timezone for readable dates and date input.
- 2Paste a Unix timestamp, then keep automatic unit detection or choose seconds or milliseconds manually.
- 3Enter a date and time to generate Unix seconds and milliseconds, then copy the individual result you need.
10-digit and 13-digit timestamps
The number of digits usually identifies the unit used by current application data.
| Digits | Unit | Example | Typical use |
|---|---|---|---|
| 10 | Seconds | 1704067200 | APIs, server logs and database records |
| 13 | Milliseconds | 1704067200000 | JavaScript and systems that need sub-second precision |
This page handles seconds and milliseconds. It does not currently parse 16-digit microseconds or 19-digit nanoseconds.
Unix timestamps, UTC and timezones
A Unix timestamp does not contain a timezone. It identifies a single point in time relative to the Unix epoch in UTC.
When converting a timestamp, this page shows the time in your selected timezone and an ISO 8601 UTC value. A date entered in the date field is interpreted in the selected timezone, so check the timezone and UTC offset before copying the result.
Formats shown by this converter
The tool keeps the machine value and the readable date together so you can check API, log and database values.
- Unix seconds
- A whole-second value such as 1704067200
- Unix milliseconds
- A millisecond value such as 1704067200000
- Selected date and time
- A readable value formatted in the browser, UTC, Hong Kong or Shanghai timezone
- ISO 8601 UTC
- A standard UTC value ending in Z, such as 2024-01-01T00:00:00.000Z
Timestamp converter FAQ
How can I tell whether a timestamp uses seconds or milliseconds?
Current Unix timestamps normally have 10 digits when measured in seconds and 13 digits when measured in milliseconds. This converter accepts both.
Does a Unix timestamp include a timezone?
No. A Unix timestamp represents one point in time and does not store a timezone. Timezones only affect how that point is displayed as a date and time.
Why does the same timestamp show a different time on another device?
The devices or tools may use different selected timezones. The underlying timestamp is unchanged, while the readable date and time reflect the chosen timezone.
Which timezone is used for a date I enter?
The date field is interpreted in the timezone selected above the converter. Choose the browser timezone, UTC, Hong Kong or Shanghai, then verify the displayed UTC offset before copying.
Is my timestamp or date uploaded?
No. The conversion runs in your browser. The timestamp and date entered in this tool are not sent for server-side conversion.
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