The SET TIME command tells the Debugger to put time stamps on each trace message and specifies the format of these stamps. A time stamp shows the elapsed time since the prototype execution began. As noted previously, time is not incremented when the prototype being debugged is in the debug mode.
The first two forms are the same with format SECONDS being default. Time stamps are printed in this case as SS.LLL, where SS is seconds and LLL is milliseconds.