如何在 Athena 中将 GMT 字符串转换为日期

Question

I have a column filled with dates in string format, eg 2023-01-31 11:21:33 GMT .

I am trying to write a query that will select a year and a month and will do some calculations later on. My standard approaches using EXTRACT(YEAR FROM a)) etc. did not work. Therefore, I am trying to parse datetime using PARSE_DATETIME(a, 'yyyy-mm-dd hh:mm:ss') . The thing is, I don't know how to format "GMT" and google did not help with that.

The error message is INVALID_FUNCTION_ARGUMENT: Invalid format: "2023-01-31 11:21:33 GMT" is malformed at "GMT" .

Answer 1

Use 'yyyy-MM-dd HH:mm:ss z' :

select parse_datetime('2023-01-31 11:21:33 GMT', 'yyyy-MM-dd HH:mm:ss z')

Output:

_col0
2023-01-31 11:21:33.000 UTC

parse_datetime is Java date function which uses JodaTime's DateTimeFormat pattern format which is mostly compatible with java.text.SimpleDateFormat with z matching general timezone .