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Timestamp Converter in practice.

Convert Unix seconds, milliseconds, and ISO dates with explicit timezones.

Make sense of a moment

Timestamp Converter

Move between Unix timestamps and ISO dates. View the same instant in UTC, your local timezone, or a timezone you choose.

On-device processingFree to useNo account needed
Unix seconds
0
UTC date
1970-01-01

00:00:00 UTC
Example input → output · Your data stays in your browser
Processed locally

Ready when you are.

How to use the timestamp converter

Unix timestamps count time from the UTC epoch at the beginning of 1970. Select seconds or milliseconds explicitly; guessing units can move a date by decades. For date input, supply an ISO 8601 timestamp with Z or a numeric timezone offset. Output includes UTC, your browser local representation, Unix seconds, and milliseconds. Local display depends on device timezone settings.

Work directly in the input area at the top of this page and choose the settings that match your task. Run the action to see the output separately from your original input. Start with a small example whose result you can check, then process the value you actually need. Changing an input clears an older result so it cannot be mistaken for a fresh conversion.

Processing runs in your browser. This tool does not send your input to a conversion server, create an account history, or save the input in browser storage. A copied result remains subject to your device clipboard settings, while a downloaded file stays on your device until you remove it. Anyone with access to your screen or browser can still see the information you enter.

Use Copy for text output or Download for a local file. If clipboard access is unavailable, select the output and copy it manually. Clear removes the current result and any main text or file input; settings remain available for another run. Keep original files and important values until you have checked that the output works in the application where you intend to use it.

Frequently asked questions

Are the numbers seconds or milliseconds?

Unix timestamps are counted in seconds; JavaScript, Java and many logging systems use milliseconds. A ten-digit number is almost always seconds and a thirteen-digit number milliseconds — pick the wrong one and your date lands in 1970 or in the year 54,000.

Which time zone are the dates shown in?

Both your local zone and UTC are shown, because a timestamp itself carries no zone. Store and compare timestamps in UTC and convert only when displaying them to a person, which avoids bugs around daylight saving changes.

What is the year 2038 problem?

Systems that store Unix time in a signed 32-bit integer overflow on 19 January 2038. This converter uses 64-bit numbers, so later dates convert correctly — but the database or embedded device you are debugging may not.