>I would like to calculate processing time, which command can
>we use ? Thanks for your time

Do you mean that you want to compue how long it took to run a particular piece of code? That's pretty simple; you can record the date/time at the start of processing in a variable, and then subtract that from the date/time at termination to get the run time in seconds:

LOCAL tStartTime, nDurationInSeconds
tStartTime = DATETIME()
* Do whatever you want to do here
nDurationInSeconds = DATETIME() - tStartTime