I have a field, timestamp, in Data Studio. The type is DateTime.

When I try to sort on timestamp, the order is not correct, and it seems to be because it is not using 24 hour format.

How can I show a datetime timestamp formatted as 24 hour format in Google Data Studio?
I have tried different uses of FORMAT_DATETIME, TODATE and PARSE_DATETIME, but can't get it to work correctly.
What I have, is the format "May 17, 2021, 2:37:55 PM".
What I want is the format "2021-05-17, 14:37:55"
