If the procedure will never be less than a few hours, this is just a matter of checking whether end time is less than start time - code added below. For a procedure or event that can take more than 24 hours, you have to have a separate field for end date. ---Jamie

Dale wrote:

I'm a novice epidata user and am calculating elapsed time for a procedure (never more than a few hours) which can cross midnight. This is implicit if the ending time is less than the starttime. Can anyone suggest how modify the code below to add a day when the endtime is after midnight? Thanks! --Dale

BEFORE FILE DEFINE varStartTime ########.##### DEFINE varEndTIME ########.##### END

STARTTIM RANGE 0 23.59 END

ENDTIME RANGE 0 23.59 AFTER ENTRY varStartTime=STARTDAT+TIME2NUM(STARTTIM) varEndTime=STARTDAT+TIME2NUM(ENDTIME)

if endtime < starttim then varendtime = varendtime + 1 // add one day to end time endif HOURSMIN=NUM2TIME(varEndTime-varStartTime)

END

HOURSMIN NOENTER END