What is Unix epoch time?

Unix epoch time (also called POSIX time or Unix time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC. This date is known as the Unix epoch. It provides a simple, timezone-independent way to represent a point in time as a single integer.

What is the Year 2038 problem?

The Year 2038 problem affects 32-bit systems that store Unix time as a signed 32-bit integer. The maximum value (2,147,483,647) corresponds to January 19, 2038 at 03:14:07 UTC. After this moment, the integer overflows and wraps to a negative number. Modern 64-bit systems are not affected.

What is the difference between epoch seconds and milliseconds?

Epoch seconds are typically 10 digits (e.g., 1700000000) and count whole seconds since the Unix epoch. Epoch milliseconds are 13 digits (e.g., 1700000000000) and include sub-second precision. JavaScript's Date.now() returns milliseconds; Python's time.time() returns seconds. This tool auto-detects the format.

Is epoch time affected by timezones?

No. Epoch time is always based on UTC. The same epoch value represents the same instant in time regardless of timezone. When you convert an epoch to a human-readable date, that's when timezone matters — the same epoch will show different clock times in different timezones.

Is epoch time affected by daylight saving time?

No. Since epoch time is based on UTC, which does not observe daylight saving time, epoch timestamps are continuous and unambiguous. DST only affects the human-readable representation when converting to a local timezone.

How do I convert epoch time in JavaScript?

To convert epoch seconds to a Date: const date = new Date(epochSeconds * 1000). To get the current epoch: Math.floor(Date.now() / 1000). JavaScript uses milliseconds internally, so multiply seconds by 1000.

How do I convert epoch time in Python?

Use datetime.fromtimestamp(epoch, tz=timezone.utc) to convert epoch to date. Use int(time.time()) to get the current epoch. Python's time.time() returns seconds with decimal precision.

Does this tool send my data to a server?

No. Epoch Converter runs entirely in your browser using client-side JavaScript. There are no API calls, no tracking, no cookies, and no data collection. The page works offline after initial load.

Epoch Converter

Unix timestamp tool & world clock

Timestamp or date

Dates without a timezone use your browser timezone. Inputs that include a timezone or UTC offset are detected automatically. Try now • paste any epoch or date • +1h -30m to shift

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Epoch Seconds

1_700_000_000

10 digits · resolution: 1 second

Used by: Python time.time(), Unix shell, most APIs

Epoch Milliseconds

1_700_000_000_000

13 digits · resolution: 1 millisecond

Used by: JS Date.now(), Java System.currentTimeMillis()

Notable Timestamps

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Leap seconds are occasional one-second inserts in UTC that keep civil clocks aligned with Earth's slowly changing rotation.

Unix time is a continuous count, so most systems ignore leap seconds and treat those adjustments as if time stays linear.

The last announced leap second was added on 2016-12-31 23:59:60 UTC; your converter still works the same because it uses standard browser epoch behavior.

Epoch Converter

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Epoch Seconds

Epoch Milliseconds

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