I found this formula in the community. However I want to include a timestamp aswell. Since {date 1}, {date 2}, {date 3} may occur on the same day. I tried adding a format specifier but it wont work... The formula sets the time to a default 12:00am instead of the actual time that is showing on the datefields.
IF( OR({Date 1}, {Date 2}, {Date 3}), DATETIME_PARSE( MAX( IF({Date 1}, VALUE(DATETIME_FORMAT({Date 1}, 'YYYYMMDD'))), IF({Date 2}, VALUE(DATETIME_FORMAT({Date 2}, 'YYYYMMDD'))), IF({Date 3}, VALUE(DATETIME_FORMAT({Date 3}, 'YYYYMMDD'))) ), 'YYYYMMDD' ) )