Creating a Formula using Time

[Annamei]

I am attempting to create a formula using Time, the field is not returning
the correct information, I have tried it without the colon in the time field
and it worked but I would like to include the colon.

i.e.:
TimeOut - TimeIn + TravelTime = TotalTime
when I enter
10:50 - 09:20 + 00:33 = NaN

when I enter
1050 - 0920 + 0033 = 163

Any suggestions? I am using Info Path 2003

 

[S.Y.M. Wong-A-Ton]

Try this article:
http://enterprise-solutions.swits.n...=time-calculations-using-rules&c=infopath2003