DevCoreTools

Developer date tool

Unix Timestamp Converter

Convert Unix timestamps to readable dates, and convert dates back to epoch time instantly in your browser.

Unix timestamp input

Paste seconds or milliseconds and choose a unit.

Whitespace is trimmed. Negative timestamps are supported when the browser date range allows them.

Timestamp unit

Safe examples

Converted results

Results appear after a valid conversion.

No conversion yet

Enter a timestamp or date, or load one of the safe examples.

What is a Unix timestamp?

A Unix timestamp represents time as the number of seconds since January 1, 1970 at 00:00:00 UTC. It gives systems a compact, time-zone-independent way to store an instant.

Unix seconds vs milliseconds

Many APIs and databases use Unix seconds, while JavaScript Date values commonly use milliseconds. This converter supports both and can auto-detect typical values.

How to use this timestamp converter

  1. Paste a timestamp or choose the date-to-timestamp mode.
  2. Select seconds, milliseconds, or auto-detect.
  3. Review the UTC, local, ISO, and epoch results.
  4. Copy the individual value or all results.

Common use cases

  • API debugging and database records
  • Logs and token expiration checks
  • Scheduled jobs and event tracking
  • Testing date and time logic

UTC vs local time

UTC is a global reference without a local offset. Local time applies the time zone configured in your browser or operating system, so the clock time may differ while representing the same instant.

ISO 8601 dates

ISO 8601 provides an unambiguous, sortable date format commonly used in APIs, logs, databases, and configuration. A trailing Z indicates UTC.

Privacy

All conversions happen locally in your browser. Values are not uploaded, stored automatically, or included in analytics events.

Keep working

JSON FormatterFormat, validate, inspect, and export JSON locally.JWT DecoderDecode JWT headers, payloads, claims, and timestamps locally.Base64 Encoder/DecoderEncode and decode Base64 and Base64URL text in your browser.
URL Encoder/DecoderComing soon
Encode and decode URL components and query-string values.
UUID GeneratorGenerate standards-compliant UUID values in useful formats and batches.Regex TesterTest patterns, capture groups, flags, and multiple values locally.SQL PrettifierFormat and minify SQL locally with dialect-aware options.

Frequently asked questions

Is this Unix Timestamp Converter free?

Yes, it is free to use.

Does this tool upload my timestamp or date values?

No. Conversions happen locally in your browser.

What is Unix time?

Unix time is the number of seconds since January 1, 1970 at 00:00:00 UTC.

Does JavaScript use seconds or milliseconds?

JavaScript Date values commonly use milliseconds, while Unix timestamps are often represented in seconds.

Can this tool convert milliseconds?

Yes, it supports both seconds and milliseconds.

What is UTC?

UTC is a standard global time reference used in servers, APIs, logs, and databases.

Why does my local time differ from UTC?

Local time includes your browser or system time zone offset, while UTC does not.

Can I copy the converted timestamp?

Yes, copy buttons are available for the main outputs.