How does automatic unit detection work?

It uses magnitude ranges typical of current Epoch values. Older dates can be ambiguous, so selecting the known unit is safer when context is available.

Are microseconds and nanoseconds rounded away?

No. Integer arithmetic preserves them during conversion. Browser dates render milliseconds, so the additional digits are shown separately in precise UTC and ISO output.

Can the converter handle dates before 1970?

Yes. Negative Unix values are supported within the date range the browser can represent.

What happens at a daylight-saving transition?

Local mode uses the browser's timezone rules and reports invalid or ambiguous wall times instead of applying a fixed offset silently.

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Unix Timestamp & Epoch Converter

Translate Epoch values across four precision levels and convert local or UTC dates without sacrificing sub-millisecond digits.

Current Unix Timestamp

Live values from your browser clock.

Seconds

1791934172

Milliseconds

1791934172906

Microseconds

1791934172906000

Nanoseconds

1791934172906000000

Timestamp → Date

TimestampUnit

Code Examples

JavaScript

// Current Unix timestamp (seconds)
const timestamp = Math.floor(Date.now() / 1000);

// Unix timestamp to Date
const date = new Date(timestamp * 1000);

Your timestamps and dates are processed locally in your browser and are not uploaded.

How to use Unix Timestamp & Epoch Converter

1
Copy the live current Epoch value in seconds, milliseconds, microseconds or nanoseconds if needed.
2
For Timestamp → Date, enter an integer or decimal value and select Auto or its known unit.
3
Review local time, UTC, ISO 8601, relative time and any preserved fractional precision.
4
For Date → Timestamp, enter the wall time and choose Local or UTC interpretation explicitly.
5
Copy any of the four Epoch outputs or expand a language-specific Code Example.

Frequently asked questions

About Unix Timestamp & Epoch Converter

Epoch data appears in several units, and passing a long integer through ordinary floating-point arithmetic can lose precision. This converter parses the value with integer-safe logic, supports negative timestamps and retains microsecond or nanosecond digits even though JavaScript dates themselves resolve only to milliseconds.

The reverse workflow makes timezone intent explicit. A typed wall time can be interpreted through the browser's local IANA rules or directly as UTC, producing all four Epoch units from one instant. Live current values and concise examples for six programming languages round out the workspace without contacting a time service.