1. This column formula should give the number of working days between the two days:
Try( Sum( Day Of Week( Index( :A, :E, 86400 ) ) < 6 ) - 1 )
Paste this into the Formula editor. The Try() is only needed if you have empty cells in the date column. The -1 is there to exclude the start (or end) date from the sum. 86400 is the number of seconds in 24 hours.
2. The column formula equivalent to PMroz suggestion would be:
(:E - :A) / 86400
How about using the Column Info and specify Start Date and End Date columns with Data Type = Numeric, Modeling Type = Continuous, Format=Date=m/d/y, Input Format=Date=m/d/y. Then add an additional column and using the Column Formula specify End Date-Start Date and also choose Format Duration :day:hr:min
If your start and end date columns are Continuous, Numeric, Date format; then the formula for the duration between the two columns in days could be something like: Date Difference(:Start Date, :End Date, "day")
If your date columns are character, then you can parse the text like PMroz did above with:
informat(:Start Date, "m/d/y"),
informat(:End Date, "m/d/y"),
This is working , but I dont want to include weekends in my calcuation..Is there any way to calculate only weekdays?