The DateAdd functon lets you add a certain amount of time to any date. You can determine what will be a week from now, what was 3 days ago, or any other difference.
The format of the DateAdd function is
DateAdd(code, count, date)
Code comes from the table below and indicates what unit of time you are adding to your initial date:
Code
Time Span
yyyy
Year
q
Quarter
m
Month
y
Day of year
d
Day
w
Weekday
ww
Week of year
h
Hour
n
Minute
s
Second
Count is the number of those units you will be adding - 3 days, 4 hours, 1 month. This can be negative if you want to go backwards in time.
Date is the starting date you wish to begin with.
So to take today's date and figure out what the date was one month ago, you would use
