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Unix Timestamp Converter

Convert Unix timestamps in seconds or milliseconds to ISO 8601, UTC, local and IANA timezone dates, or turn a date back into a timestamp.

Unix Timestamp Converter

Current Unix timestamp
—
Current time (local)
—

Timestamp to date

Enter a Unix timestamp above

Date to timestamp

Enter a date/time above

What this tool does

You can convert a Unix timestamp to a readable date (and back) directly in the browser: paste the number and get ISO 8601, UTC, local time, a chosen timezone, and relative time at once. The converter detects the unit by magnitude — a 10-digit value is seconds, a 13-digit value is milliseconds. A timestamp itself has no timezone; only its rendering does.

Updated . Provided as is. Check the output before you rely on it in production.

How to use Unix Timestamp Converter

  1. 1

    Enter a Unix timestamp

    Paste a timestamp in seconds or milliseconds since 1970-01-01 UTC. The tool detects the unit.

  2. 2

    Read the converted date

    See the timestamp as ISO 8601, UTC, your local time and a relative description such as 3 days ago.

  3. 3

    Convert a date to a timestamp

    Enter a date such as 2026-02-11 12:00:00 or an ISO 8601 string to get seconds and milliseconds back.

  4. 4

    Pick the timezone

    Choose the timezone the input and output are read in, so the result matches the system you are debugging.

  5. 5

    Jump in time

    Use Now, +1 hour, +1 day or +1 week to generate timestamps for tests and fixtures.

Questions and answers

What is Unix Timestamp Converter?
Unix time counts seconds since 1970-01-01 00:00:00 UTC, and many APIs use milliseconds instead. This converter detects which one you entered and shows the date as ISO 8601, UTC, local time, a chosen IANA timezone and relative time. It also converts dates back to timestamps and shows a live clock.
Does Unix Timestamp Converter store or send my data?
No. All processing happens entirely in your browser. Your timestamps stay on your device — nothing is sent to any server.
What is a Unix timestamp?
A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. It is the standard way computers represent time internally and is used extensively in APIs, databases, and log files.

Use it as an API

Unix Timestamp Converter is also callable as a free HTTP JSON API at https://aidevhub.io/api/timestamp-converter/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, fair use (abusive traffic is throttled at the edge; there is no per-request quota header). Responses return { ok, tool, result, meta }. 

curl -s "https://aidevhub.io/api/timestamp-converter/?input=1752307200&direction=timestamp_to_date"

Machine-readable contract: /api/tool/timestamp-converter.json All API endpoints: /agents/ LLM site index: /llms.txt

For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/timestamp-converter/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/timestamp-converter/ GET timestamp-converter
POST /api/timestamp-converter/ POST timestamp-converter

How do I convert a Unix timestamp to a human-readable date?

Paste the timestamp into the left panel. Unix time counts seconds since the epoch, 1970-01-01T00:00:00 UTC, so the number itself carries no timezone — the converter renders that single instant as ISO 8601, UTC, your local time, any of 22 common timezones, and a relative phrase like "3 hours ago". The right panel goes the other way: type an ISO 8601 date or YYYY-MM-DD HH:MM:SS and get seconds and milliseconds back.

Step by step

  1. Paste the raw number — no unit needed. The converter reads a 10-digit number as seconds and a 13-digit one (1012 or larger) as milliseconds, and tells you which it detected.
  2. Pick a timezone from the selector to render the same instant in another region alongside UTC and local time.
  3. Click any result row to copy it; the Now, +1 hour, +1 day, and +1 week buttons generate reference timestamps.
  4. For the reverse direction, paste a date string; the live clock at the top shows the current Unix timestamp ticking each second.

Seconds or milliseconds? Epoch unit boundaries

Value Unit Meaning
0 seconds The Unix epoch: 1970-01-01T00:00:00Z.
1000000000 – 9999999999 seconds (10 digits) 2001-09-09 through 2286-11-20 — every present-day seconds timestamp has 10 digits.
2147483647 seconds 2038-01-19T03:14:07Z — the largest value a signed 32-bit integer holds (the "year 2038 problem").
> 1012 milliseconds (13 digits) This converter's detection threshold: larger values are treated as milliseconds, the unit JavaScript's Date.now() returns.

Detection as implemented in this converter. Microsecond (16-digit) and nanosecond (19-digit) timestamps are not auto-detected — divide by 1,000 or 1,000,000 first.

Is a Unix timestamp in UTC?

Strictly, a Unix timestamp has no timezone at all — it is a count of seconds since an instant that is defined in UTC. The same number denotes the same moment everywhere on Earth; converting it "to a timezone" only changes the wall-clock rendering. This is why storing timestamps (or ISO 8601 with an explicit offset) beats storing local datetime strings: nothing shifts when servers or users change zones.

Does Unix time count leap seconds?

No. Unix time pretends every day is exactly 86,400 seconds, so leap seconds are absorbed rather than counted. For logging, scheduling, and API work this never matters; it only matters if you need sub-second astronomical accuracy across decades, which calls for TAI-based time instead.

Do converted timestamps leave the browser?

No. All conversion runs client-side with the browser's own date and timezone machinery; nothing is uploaded. Timestamps from logs and tokens can reveal user activity patterns, so a local-only converter is the right default when you are debugging production data.