RFSTDTC vs RFXSTDTC

[Igr]

Could you please tell the difference between RFSTDTC and RFXSTDTC ?

[Namana]

RFXSTDTC & RFXENDTC are the new variable added in SDTM IGv3.2. Earlier RFSTDTC or RFENDTC are used for the start date/time of exposure and end date/time of exposure, but now there are specific variable introduced RFXSTDTC and RFXENDTC for the same.

[chandanakorrapa]

its specified in SDTM IG that  -  RFXSTDTC may be the same as RFSTDTC, but it might be different for some studies. An example of the latter would be when RFSTDTC was defined
as the date the informed consent was signed. RFXSTDTC should be the same as SESTDTC for the first treatment Element described in the SE dataset