Unix Timestamp Converter

Convert seconds or milliseconds to dates and times, and view Beijing time, UTC and ISO 8601 representations for API debugging and log analysis.

⏱️ Timestamp conversion

Convert between Unix timestamps (seconds / milliseconds) and date-time values · Defaults to UTC; choose another time zone if needed

Display time zone

Defaults to UTC. Your selection applies to the conversions below and is saved locally.

UTC--

Timestamp (seconds)--

Timestamp (milliseconds)--

📅 Date-time → timestamp

Choose a date and time

Or enter a date-time string (takes priority when provided)

Dates are interpreted in the selected time zone. Ambiguous or nonexistent times during daylight-saving transitions produce an error. Supports YYYY-MM-DD and YYYY-MM-DD HH:mm:ss.

🔢 Timestamp → date-time

Enter timestamp

Unit

Auto-detection uses digit count only. Select the unit manually for early millisecond timestamps or longer second timestamps.

Worked example

A 10-digit timestamp usually represents seconds and 13 digits usually milliseconds. Select a time zone and enter 2026-09-01 12:00:00 to obtain both values.

Understanding settings and results

The Unix epoch is 1970-01-01 00:00:00 UTC.
The same instant can display different dates in different time zones while retaining the same timestamp.

Scope and limitations

Dates without time-zone information use the selected zone. Automatic unit detection only guesses from digit count; explicitly select seconds or milliseconds for precise conversion.
Invalid dates and local times skipped or repeated by daylight saving are rejected. Use a known Unix timestamp when a local time is ambiguous.

Troubleshooting

For a result off by 1000, check seconds versus milliseconds.
For an 8-hour difference, check UTC versus Beijing time.

Privacy and processing

Dates and timestamps are calculated locally in the browser.