Overtime Sheet (calculate number of hours)

i create acrobat pdf file calculates overtime.

hence have start time , end time field , field must calculate total overtime per line (number of hours).

the problem have when have normal calculation field not calculate correctly, instance 17:00 start time , 18:15 end time

that 1.25 hours , not 1.15

 

how setup custom java script calculate in pdf file?

is "1.15"  1 hour , 15/100's or 1 hour , 15 minutes, 1:15?

 

what script using?

 

when calculate elapsed time using given unit them formatting hours , minutes, hh:mm, or hours?

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