Read treatment data from source dataset DM.
       Derive variables REFDT and REFTM based on the variable RFXSTDTC in TEST.DM. REFDT represent the date part of RFXSTDTC, and REFTM represent the time part. For partial date or time part, please set as missing. The output dataset should be named as WORK.DM_DTTM. Please note, the variable REFDT and REFTM should be in numeric format, and display by using date9. and time5. Format.

RFXSTDTC 变量具体内容：2012-11-30T08:00