Convert timestamps between seconds, milliseconds, UTC and Beijing time

Start with a known instant

Open the timestamp tool (Chinese interface), enter 1767225600 and select seconds. The result is January 1, 2026 at 00:00:00 UTC, or 08:00:00 in Beijing. Its millisecond timestamp is 1767225600000. These values describe one instant and have been checked against the implementation.

Diagnose a surprising year

Treating seconds as milliseconds reduces the value by a factor of 1,000. The opposite mistake increases it by that factor. Ten-digit and thirteen-digit values are common, but digit count alone is not a universal rule. Check the API or log definition before choosing the unit.

Convert a date back

Enter 2026-01-01 08:00:00 and select Beijing time. The result is again 1767225600 seconds. Interpreting the same date digits as UTC produces an instant eight hours later. Date and timezone must be specified together.

Reject invalid input

The timestamp input expects an integer, not a fractional-seconds string. February 30, 2026 is invalid and should produce an error rather than silently become a March date. Check calendar validity and numeric range before changing the input.

Apply it to log investigations

Preserve the original timestamp and unit, normalize to UTC, then compare the business-time display. Confirm the timezone used by reporting filters, particularly around midnight. This tool only offers UTC and Beijing interpretations for date input; it is not a universal daylight-saving-time converter. Include unit and timezone labels when sharing a converted value.