In Excel, the DateDiff function returns the difference between two date values, based on the interval specified.
The syntax for the DateDiff function is:
DateDiff( interval, date1, date2, [firstdayofweek], [firstweekofyear] )
interval is the interval of time to use to calculate the difference between date1 and date2. Below is a list of valid interval values.
- yyyy - Year
- q - Quarter
- m - Month
- y - Day of year
- d - Day
- w - Weekday
- ww - Week
- h - Hour
- n - Minute
- s - Second
date1 and date2 are the two dates to calculate the difference between.
firstdayofweek is optional. It is a constant that specifies the first day of the week. If this parameter is omitted, Excel assumes that Sunday is the first day of the week.
firstweekofyear is optional. It is a constant that specifies the first week of the year. If this parameter is omitted, Excel assumes that the week containing Jan 1st is the first week of the year.
Sub TestDates mydiff = DateDiff("d", "8/14/09", "8/14/10") End Function