calculate the difference between two time stamps in hh:mm:ss

good morning all,

I've searched the archives, but didn't find much help - I'm trying get
hh:mm:ss from the difference between two timestamp fields for displaying in
user readable format on a dspf.

Is there a way to do this without having to manually calculate hours and
minutes from seconds?  - in other words, why can't I just subtract one time
stamp from another giving a time (t) data type?

I've tried several ways, but I'm coming up with incompatable types and
can't get it to compile.  Am I missing something?  a bif i haven't seen
yet?

Here is what I've tried so far:

D $StrTime        S               z
D $NewTime        S               z
D $WrkElapse      S               t

 * (F1Elapse is 6S 0 dspf field)

---try number 1------
.....
C                   time                    $StrTime
.....
C                   time                    $NewTime
C                   eval      $WrkElapse = $NewTime - $StrTime
C     *hms          move      $WrkElapse    F1Elapse

---try number 2------
.....
C                   time                    $StrTime
.....
C                   time                    $NewTime
C                   eval      $WrkElapse =
C                                   %diff($StrTime:$NewTime:*seconds)
C     *hms          move      $WrkElapse    F1Elapse

---------


thanks,

Rick