Unix Timestamp Time Stamp Conversion

What is a timestamp?

Unix timestamp is a way of representing time, defined as the total number of seconds from 1970-01-01 00:00:00 GMT to now. The feature of the timestamp is that, regardless of the time zone, the calculated value at the moment will be the same. This is very useful for applications, whether tracking time, calculating time differences, or sorting dates. When converting a timestamp to time, you can also calculate the local time according to the time zone. It is a widely used technique in programming.

• When talking about time consistency, it's hard not to mention timestamps. There is no time zone concept, and the unit is 'seconds' or 'milliseconds'.
• The unit of timestamp is 'milliseconds' or 'seconds', calculated from 1970-01-01 00:00:00 GMT.
• Timestamps have no time zone concept. Whether in Moscow or Taipei, the same timestamp is obtained at the same moment, but the same timestamp can be converted to local time according to the time zone difference.

Time zones (GMT, UTC, CST?)

• Common time zone representations are GMT, UTC, and CST. What are the differences?
• GMT: Greenwich Mean Time, this is what is taught in elementary school. Greenwich is GMT+0000, Taipei is GMT+0800.
• UTC: Coordinated Universal Time, not much different from GMT, but is the more commonly used international format. Greenwich is UTC+0000, Taipei is UTC+0800.
• CST: China Standard Time, basically not used because it is unclear which country 'Standard' refers to. For example, it could be the US, Beijing, or Australia.

ISO time format

• ISO format: YYYY-MM-DDTHH:mm:ss.msZ or YYYY-MM-DDTHH:mm:ss.ms+timezone
• T: is the symbol that separates 'date' and 'time'.
• Z: means UTC+0. If you see Z in the ISO format, it means this is UTC+0 time.
• Timezone: the adopted timezone, for example, Taiwan is YYYY-MM-DDTHH:mm:ss.ms+08:00.

If you want to know the time in other regions, you can refer to