DateDiff(datepart, date1, date2)Returns the number of intervals in whole units of type Datepart by which Date1 is less than Date2.
See also DateAdd, DatePart, and CreateTimeSpan.
One of the following strings:
yyyy -- Year
q -- Quarter
m -- Month
y -- Day of year
d -- Day
w -- Weekday
ww -- Week
h -- Hour
n -- Minute
s -- Second
Date/time object in the period from 100 AD to 9999 AD.
Date/time object in the period from 100 AD to 9999 AD.