Convert Unix timestamps and dates with explicit units and time zones.
Select seconds or milliseconds and a time zone, then choose Timestamp → Date. To convert in the other direction, enter a date and choose Date → Timestamp.
0 seconds corresponds to 1970-01-01 00:00:00 UTC and 1970-01-01 08:00:00 in Beijing.
Dates use YYYY-MM-DD HH:mm:ss with optional .SSS milliseconds. Beijing time is fixed at UTC+08:00. Seconds are rounded down; millisecond output preserves milliseconds.
Why is the time eight hours different? A Unix timestamp identifies one instant. The time zone only changes how dates are displayed or interpreted. Check UTC versus Beijing time.