Crystal Report - Calculate Time Clock punchtimes

I am build a crystal report that shows an employee weekly time punches and calculate the employees hours.  So far, I am able to show the punches and clock actions but I am having a breakdown on calculating the time between clock in and clock out; thusly giving me the weekly sum of hours.

I must take into account any missed punches....  Any assistance is greatly appreciated.
SELECT     EmployeeNum_1.EmployeeID, EmployeeNum_1.TempId, EmployeeNum_1.Unldr_#, EmployeeNum_1.Last_name, EmployeeNum_1.First_name, 
                      EmployeeNum_1.Active, EmployeeNum_1.PayRateHourly, EmployeeNum_1.PayRatePercentage, EmployeeNum_1.SpecialPay, 
                      EmployeeNum_1.HolidayPay, EmployeeNum_1.SalaryPay, WorkDays_1.Workdate, WorkdayPunches_1.Punchkey AS PunchKey, 
                      WorkdayPunches_1.PunchTime, WorkdayPunches_1.Action, WorkdayPunches_1.Note, WorkdayPunches_1.Deleted AS PunchDelete, 
                      WorkDays_1.deleted AS WorkDayDelete, EmployeeNum_1.JobTitle
FROM         EmployeeNum AS EmployeeNum_1 INNER JOIN
                      WorkDays AS WorkDays_1 ON EmployeeNum_1.Unldr_# = WorkDays_1.Unldr_# INNER JOIN
                      WorkdayPunches AS WorkdayPunches_1 ON WorkDays_1.UID = WorkdayPunches_1.Punchkey
WHERE     (EmployeeNum_1.Active = 1) AND (DATEPART(wk, WorkdayPunches_1.PunchTime) = DATEPART(wk, @Date))
ORDER BY WorkDays_1.Workdate, WorkdayPunches_1.PunchTime

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TimeCards.pdf
NCSOAsked:
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peter57rCommented:
What does this mean?
"I must take into account any missed punches"
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NCSOAuthor Commented:
if there is a clock-in fo that day but no clock-out, show a value of 0; this will alert the supervisor to address the missed time punch
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peter57rCommented:
"calculating the time between clock in and clock out"

This would appear to be the logic you want but I don't know what any of the fields are .
numbervar tdiff;
If onfirstrecord then
tdiff:=0
else if {table.action} = "Clock in" then
tdiff:=0
//else must be clock out; see if previous record was a clock in record
else if {table.employeeid} = previous{table.employeeid} and previous{Table.action} = "clock in"
then
tdiff:= datadiff("s", previous(table.time},{table.time})/3600  //hours and decimal hours
else
tdiff:=0;
tdiff

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NCSOAuthor Commented:
Peter57r

Is the following correct?  If so, I am getting an error in the expression builder (Unrcognized Identifier)

=numbervar tdiff;
If onfirstrecord then
tdiff:=0
else if Fields!Action.Value = "Clock in" then
tdiff:=0
//else must be clock out; see if previous record was a clock in record
else if Fields!EmployeeID.Value = previous Fields!EmployeeID.Value and previous Fields!Action.Value = "clock in"
then
tdiff:= datadiff("s", previous Fields!PunchTime.Value,{Fields!PunchTime.Value})/3600  //hours and decimal hours
else
tdiff:=0;
tdiff
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NCSOAuthor Commented:
Here is a screenshot
unreconized-identifier.JPG
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peter57rCommented:
Remove the = from the first line.

What is that screen? I don't recognise it as part of any version of Crystal that I'm using.
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NCSOAuthor Commented:
I am using the embedded version that is in Visual Studio 2005; I tried removing the "=" sign but I am trying to using the expression to fill a textbox.  When I use the code that you provided to me, the numbervar shows as an unrecognized identifer.

thanks
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