时间戳 function 是否考虑 bigquery 中的夏令时

Question

The TIMESTAMP() fucntion in bigquery takes in timezone parameter. Does it consider day light savings as well?

If there are references to specific daylight saving information, please point to the links as well.

Answer 1

Yes TIMESTAMP() considers daylight saving time. Since TIMESTAMP() converts a string, date, datetime expression to timestamp data type we can check on the data type timestamp .

A TIMESTAMP object represents an absolute point in time, independent of any time zone or convention such as Daylight Savings Time with microsecond precision.

To better understand this, here is an example to with timezone to show the behavior of timestamp when there is daylight saving time. See timezone for more details.

Consider this time as an example:

2014-09-27 12:30:00.45 America/Los_Angeles

Note that not all time zone names are interchangeable even if they do happen to report the same time during a given part of the year. For example, America/Los_Angeles reports the same time as UTC-7:00 during Daylight Savings Time, but reports the same time as UTC-8:00 outside of Daylight Savings Time.

With this example, we can say that TIMESTAMP() considers daylight saving time.