Convert Unix Timestamps and Dates Instantly Online

Free Unix timestamp converter for developers and sysadmins. It translates epoch timestamps (seconds or milliseconds) into ISO 8601, UTC, RFC 2822, local time and a human-readable "relative time" string, and converts any date back into a Unix timestamp. A batch mode processes multiple timestamps at once, and a live counter shows the current epoch.

How to convert a Unix timestamp

1
Paste the timestamp

Enter a Unix timestamp in the "Timestamp → Date" field.

2
Select seconds, ms or auto

Auto-detect works for most inputs — values at or above 10^12 are treated as milliseconds.

3
Read every format

See ISO 8601, UTC, local time, RFC 2822 and a human-readable relative time.

4
Or convert a date to timestamp

Pick a date and time and copy the corresponding seconds or milliseconds.

5
Batch many at once

Paste multiple timestamps, one per line, to batch-convert logs or analytics exports.

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Translate epoch seconds into ISO 8601, UTC and relative time with batch mode and live counter

Current Unix timestamp
—

⏱️ Timestamp → Date

📅 Date → Timestamp

Seconds
—
Milliseconds
—
ISO 8601
—

📋 Batch convert

Paste one timestamp per line (seconds or milliseconds, auto-detected). Each line is converted to ISO 8601.

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Features

Bidirectional conversion Auto-detect seconds or ms Live current timestamp Batch conversion

Frequently asked questions

What is a Unix timestamp?

A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 1 January 1970 00:00:00 UTC, not counting leap seconds. Many systems store it as seconds; JavaScript, Java and many databases store it as milliseconds.

How does auto-detect decide between seconds and milliseconds?

If the absolute value is at or above 10^12 (roughly the year 2001 in milliseconds) the input is treated as milliseconds. Everything smaller is treated as seconds. You can force either unit with the dropdown if needed.

Does it support negative timestamps?

Yes. Negative values represent dates before 1970. For example, -86400 is 31 December 1969 00:00:00 UTC.

Which time zone does local time use?

Local time is displayed in your browser's detected time zone. The converter also shows UTC and ISO 8601 so there is never any ambiguity when copying the result.

What is the "Year 2038 problem"?

A 32-bit signed Unix timestamp overflows on 19 January 2038 at 03:14:07 UTC, after which legacy time_t systems wrap to a negative value. This converter uses JavaScript Number, so it works correctly far beyond 2038.

Why does my timestamp show a slightly different time than expected?

Most commonly the wrong unit is used — confusing seconds with milliseconds gives a date thousands of years off. Switch the unit dropdown or use auto-detect. Also remember Unix time is in UTC, not your local zone.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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