dear vanagoners with Adobe knowledge

i am trying to create a form using livecycle designer ES2
which is a form creation program that Windows users of Acrobat Pro will be
familiar with ...
it uses an ISO format called FormCalc for these functions
also uses JavaScript but i am not easily grasping that one either
(but if i had the string that worked i could insert)

the big problem is i am trying to get a time equation to work within the
fields of the form

the issue is this ...
 i enter 0630 as a start time ... and 1600 as a finish time = hours worked
return is 9.1 ... tragically this has detrimental results for the overtime
field and the total time field which both take their values from the hours
worked +/_

the string looks like this  SUM(+Finish_Time-Start_Time)*.01

what i require for a return is the .5 of an hour ... rather than the .7
which is in correct ..
NOTE if i ditch the *.01 the number rounds up ...

WHAT am i missing ... ???

thanks in advance
yours

--
roger w
From Proverbs:
Under three things the earth trembles, under four it cannot bear up: a
servant who becomes king ...
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