Hi Naushin,
You can build a calculated column in your report view to achieve this. Simply go to your report builder and in the column (view) settings, add a column and convert to text mode. Then paste the following code into the text mode builder:
This code will work out the difference in weekdays between the planned completion date and the projected completion date:
displayname=Planned Projected Delta
textmode=true
valueexpression=WEEKDAYDIFF({plannedCompletionDate},{projectedCompletionDate})
valueformat=int
This code will work out the difference in weekdays between the planned completion date and the actual completion date:
displayname=Planned Actual Delta
textmode=true
valueexpression=WEEKDAYDIFF({plannedCompletionDate},{actualCompletionDate})
valueformat=int
The above examples are obviously working out the difference between completion date fields. You could also do the same for start date fields. Simple change the variable names in the code from 'plannedCompletion . . .' to 'plannedStart . . .'
I hope that makes sense! Please shout if anything is unclear.
Best Regards,
Rich.