What is a Unix timestamp?

The number of seconds (or milliseconds) since 1970-01-01 UTC, called the Unix epoch.

How do I know if a timestamp is in seconds or milliseconds?

Roughly: 10 digits = seconds, 13 digits = milliseconds. The tool auto-detects.

How do I convert ISO 8601 to a Unix timestamp?

Paste the ISO string — the tool emits the epoch value in your chosen unit.

Is my input uploaded?

No. Conversion runs in your browser using Date and Intl.DateTimeFormat.

Why does the local time differ from UTC?

Local time depends on your machine's timezone. The tool shows UTC and local side by side so you can compare.

Does it handle leap seconds?

Unix time ignores leap seconds by convention. The tool matches that behavior.

How do I convert epoch milliseconds to a date?

Paste the 13-digit millisecond value and the tool auto-detects milliseconds and shows the UTC and local date/time. Use the unit selector to override if needed.

How do I convert a date to a Unix timestamp?

Enter or pick a date/time and the tool emits the epoch value in seconds, milliseconds, microseconds, or nanoseconds.

Unix Timestamp to Date Converter

Convert Unix epoch timestamps (seconds, milliseconds, microseconds, nanoseconds) to human-readable date/time and back. Runs locally in your browser. No uploads.

Convert Unix epoch seconds/milliseconds to dates.
Convert date/time to epoch quickly.
Outputs seconds, ms, microseconds, and nanoseconds.
Share results: Generate a secure link to share your current input and results with teammates — nothing is uploaded to any server.

Epoch -> Date

Epoch value

Mode:

Waiting for input

Local

UTC

ISO (UTC)

Selected timezone

Interpretation	UTC	Local	Notes
Enter a timestamp to compare units.

Date -> Epoch

Date/time (text)

Tip: if the text has no timezone (e.g. "2025-12-26 16:00:00"), it is treated as local time.

Date/time (picker - local)

Waiting for input

Unix seconds

Unix milliseconds

Unix microseconds

Unix nanoseconds

Current Time

Advanced Timestamp Workflows

Single conversion details

Date → Timestamp builder

Date Time Fractional ms Interpret as Timezone Offset

Timezone comparison

Timezone	Date/time	UTC offset	Abbr.	DST	Action

Batch / log timestamp extraction

Location	Raw value	Detected	UTC	Local	Selected timezone	Relative	Warnings

JWT time claims

JWTs decoded here are not signature-verified. Use JWT & OAuth Toolkit for trust validation.

Claim	Raw	UTC	Local	Selected timezone	Relative	Warning

UUID v7 timestamp helper

UUID	Version	Milliseconds	UTC	Local	Selected timezone	Relative	Action

Duration breakdown

Duration Base timestamp

Developer formats and snippets

Database timestamp formats

Common database representations of the selected instant. All values are in UTC.

SQL WHERE clause for a time range

Builds a half-open range filter (>= From AND < To). Blank From/To default to the selected day in UTC. Datetime literals are UTC.

Column From To Dialect Integer epoch column (compare Unix seconds)

Next steps

Notes

This tool does not send data to a server.
Local time formatting depends on your device locale/timezone settings.
Share button creates a link like ?epoch=....
Microseconds and nanoseconds outputs are derived by multiplying the seconds value — they are not independently measured.