Timestamp Converter

Convert timestamps while debugging

Unix timestamps show up in API responses, database rows, event logs, scheduled jobs, and webhook payloads. Convert Unix timestamps to UTC, ISO 8601, and your local time so stored values are easier to compare with tickets, dashboards, and server output.

Most Unix timestamps are either 10-digit seconds, such as 1716460800, or 13-digit milliseconds, such as 1716460800000. The converter detects the value length and shows both seconds and milliseconds for easier copy and comparison.

UTC, local time, and ISO 8601

• UTC time is the safest reference for APIs, servers, logs, and scheduled jobs.
• Local time uses your device timezone, which helps when you need to match a timestamp to what a user saw.
• ISO 8601 output is easy to paste into JSON payloads, database queries, bug reports, and documentation.

Best for

• API debugging, event logs, queue messages, webhook payloads, and incident notes.
• Database bigint timestamp fields and analytics exports.
• Scheduled jobs where UTC and local time need to line up.
• JWT exp, iat, and nbf claim checks after decoding a token.

Timestamp conversion examples

• A 10-digit value such as 1716460800 is treated as Unix seconds.
• A 13-digit value such as 1759968000000 is treated as milliseconds and can be shown as UTC time, local time, ISO 8601, Unix seconds, and Unix milliseconds.
• JavaScript Date.now(), Java System.currentTimeMillis(), and database bigint fields commonly store 13-digit millisecond timestamps.
• Convert a local date into Unix seconds before adding it to a test payload or scheduled job config.

Related debugging tools

Use the JSON Formatter to inspect timestamp fields in API responses, the JWT Decoder to check token exp, iat, and nbf timestamps, the CSV to JSON Converter for exported rows, and the Regex Tester for checking date patterns in logs.

FAQ

What is a Unix timestamp?

A Unix timestamp is a count from January 1, 1970 at 00:00:00 UTC. APIs, logs, databases, and JWT claims often store it as seconds or milliseconds.

How do I convert a millisecond timestamp to a readable date?

Paste the 13-digit millisecond value, such as a JavaScript Date.now() result, and convert it. The output shows UTC time, local time, ISO 8601, Unix seconds, and milliseconds.

What is the difference between UTC and my local time?

UTC is the shared reference time used by many systems. Local time applies your device timezone and daylight saving rules, so it can show a different clock time for the same timestamp.

Can I convert future dates?

Yes. Enter a future local date and convert it to Unix seconds, milliseconds, and ISO 8601.

What is epoch time?

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

Does this use my local timezone?

Yes. Local output uses your device timezone, while UTC and ISO values remain timezone-neutral.