Bonjour
The syntax for the Microsoft Excel DateDiff function is:
DateDiff( interval, date1, date2, [firstdayofweek], [firstweekofyear] )
Interval__________________Explanation
yyyy_____________________ Year
q_____________________ Quarter
m_____________________ Month
y_____________________ Day of year
d_____________________ Day
w_____________________ Weekday
ww_____________________ Week
h_____________________ Hour
n _____________________ Minute
s_____________________ Second