Unix Timestamp Formatter

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How to use the Unix Timestamp Formatter

Decode any Unix timestamp into a full suite of human-readable date and time information in just a few clicks.

1

Paste your Unix timestamp

Enter your epoch value into the input field. The tool automatically detects whether your timestamp is in seconds (10 digits) or milliseconds (13 digits) and adjusts accordingly.

2

Select timezones to display

Choose one or more timezones from the selector — including UTC, your local timezone, and any regional zone you need. The timestamp is converted to each selected timezone simultaneously.

3

Review and copy metadata

The results panel shows the full date-time string, ISO 8601 format, UTC offset, week number, day of year, and a relative time description. Click any copy icon to grab a specific value.

When to use this tool

Use the Unix Timestamp Formatter any time you encounter a raw epoch value in a log, API response, or database and need to understand what date and time it actually represents.

  • →Decoding timestamps in server logs or error traces to determine the exact time an event occurred.
  • →Validating that a Unix timestamp returned by an API or webhook corresponds to the expected date and time.
  • →Converting epoch values in a database dump or CSV export into readable dates for analysis or reporting.
  • →Checking how a timestamp displays across multiple timezones when building an internationally used application.
  • →Debugging JWT (JSON Web Token) exp and iat claims, which are stored as Unix timestamps.
  • →Quickly calculating relative time (e.g., 'how long ago was this event?') from a raw epoch value without mental math.

Frequently asked questions

Q:What is a Unix timestamp?
A Unix timestamp (also called epoch time) is the number of seconds — or milliseconds in modern systems — that have elapsed since 00:00:00 UTC on January 1, 1970, known as the Unix Epoch. It is a universal, timezone-independent way to represent a specific point in time, widely used in databases, APIs, server logs, and programming languages across all platforms.
Q:How does the tool tell if a timestamp is in seconds or milliseconds?
The tool uses digit count as the primary heuristic: a 10-digit value is treated as seconds, and a 13-digit value is treated as milliseconds. This covers the vast majority of real-world timestamps in use today. For timestamps with unusual lengths (e.g., microseconds), you can manually override the unit using the input selector.
Q:What is the difference between a Unix timestamp and an ISO 8601 string?
A Unix timestamp is a single integer representing seconds since the Epoch — compact and timezone-independent, but not human-readable. An ISO 8601 string (e.g., 2026-03-26T14:30:00Z) is a formatted, human-readable representation of the same moment that explicitly encodes the date, time, and timezone offset. APIs often return Unix timestamps internally but require ISO 8601 strings in user-facing data.
Q:Can I convert a timestamp to any timezone, including IST or AEST?
Yes. The tool supports all IANA timezone identifiers, including major zones like IST (Asia/Kolkata), AEST (Australia/Sydney), PST (America/Los_Angeles), CET (Europe/Paris), and any other timezone in the global IANA database. This makes it practical for globally distributed teams who need to correlate log events across regions.
Q:What metadata does the tool provide alongside the formatted date?
Beyond the basic date-time string, the tool outputs the ISO 8601 representation, UTC offset for the selected timezone, the ISO week number (useful for weekly reporting), the day of year (1–365/366), the day of week, and a relative time description such as '3 hours ago' or 'In 2 days'. This gives you a complete picture of the timestamp in a single view.
Q:Can I use this tool to generate the current Unix timestamp?
Yes. The tool includes a 'Use current time' button that populates the input with the current Unix timestamp at the moment you click it, accurate to the millisecond. This is useful for quickly checking what 'now' looks like across different timezones or for generating a fresh timestamp to use in testing or debugging.