The units for the date difference function are as follows:
y - years
l - months
w - weeks
d - days
wd - working days
h - hours
m - minutes
s - seconds
If you have two date fields, or two time fields, you can use the Date Difference function to return the difference based on the value of the units. So, for example, if you had a start and end (time/date), To calculate the difference using the Date Difference function, you would enter the End (date/time) as the first value, the Start (date/time) as the second value, and the corresponding unit in which you wish to calculate the results in.
