With the following form you can interact with the SAS task cifbuild. Only two parameters of that task are of relevance here: the observation date and the analysis date. Both have the following format: yyyy-mm-ddThh:mm:ss. The string now is also a valid date.
The observation date is available in sereval places, one of these is in the ODF constituent rrrr_oooooooooo_SCX00000SUM.ASC. For example:
OBSERVATION
0092970701 / Observation/Slew Identifier
0269 / Revolution number
2001-05-29T17:16:58 / Scheduled Start Time <-- Use this date
2001-05-29T20:47:05 / Scheduled Stop Time
The analysis date will in general be now, but can also be any other date. You should read the documentation of the task cifbuild for more details.