Unix Timestamp Converter API

Convert unix timestamps to dates and dates to epoch seconds or milliseconds online. Live clock, timezone-aware output, free and fast.

The Unix Timestamp Converter is also available as a free REST API. Send a POST request with a JSON body to https://dot.tools/api/tools/unix-timestamp — no authentication, no API key, CORS enabled. Successful calls return { "ok": true, "result": { … } }; failures return HTTP 400 or 422 with an error body.

Request body

Field	Type	Required	Description
`mode`	"unix-to-date" \| "date-to-unix"	required	Conversion direction: unix timestamp to date, or date to unix timestamp.
`input`	string	required	For unix-to-date: a unix timestamp (integer or fractional seconds). For date-to-unix: an ISO 8601 date string. Strings without a timezone offset are interpreted as UTC.
`unit`	"auto" \| "s" \| "ms"	required	Unit of the input timestamp for unix-to-date. "auto" treats absolute values >= 1e12 as milliseconds, otherwise seconds. Ignored for date-to-unix.

Response

Field	Type	Required	Description
`unix`	unknown	required	Unix timestamp in whole seconds (fractional input is floored).
`ms`	unknown	required	Unix timestamp in milliseconds.
`iso`	unknown	required	ISO 8601 representation of the date in UTC.
`utc`	unknown	required	Human-readable UTC string of the date.
`error`	unknown	required	Error message when the input could not be converted.

Example request

curl -X POST https://dot.tools/api/tools/unix-timestamp \
  -H 'Content-Type: application/json' \
  -d '{
  "mode": "unix-to-date",
  "input": "1750000000",
  "unit": "auto"
}'

Sample response

{
  "ok": true,
  "result": {
    "unix": 1750000000,
    "ms": 1750000000000,
    "iso": "2025-06-15T15:06:40.000Z",
    "utc": "Sun, 15 Jun 2025 15:06:40 GMT",
    "error": null
  }
}

Use the free Unix Timestamp Converter in your browser, read the Unix Timestamp Converter guide, or import the full OpenAPI specification.