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4GuysFromRolla.com : ASP FAQS : Dates and Times


How can I add or subtract time from a date?

[Print this FAQ]

Answer: VBScript provides a handy function for adding or subtracting various intervals to a date variable. This function, DateAdd has the following definition:

DateAdd(interval, number, date)

The interval specifies the date part that you wish to add or subtract from the date. interval can have the following values:
yyyy - Year
q - Quarter
m - Month
y - Day of year
d - Day
w - Weekday
ww - Week of year
h - Hour
n - Minute
s - Second

Observe the following script to see how to use DateAdd with various intervals:

'Get the current date/time
Dim dtNow
dtNow = Now()

'Will display the date/time 24 hours from now
Response.Write DateAdd("h", 24, dtNow)

'Will display the date/time 12 hours PRIOR from the current time
Response.Write DateAdd("h", -12, dtNow)

'Will display the date/time 1 week from now
Response.Write DateAdd("ww", 1, dtNow)

'Will display the date/time two months ago
Response.Write DateAdd("m", -2, dtNow)

Note that to subtract time, you simply specify a negative number.

For more information on DateAdd be sure to read the technical docs and this 4Guys article: Using VBScript's Date Functions.

Happy Programming!

FAQ posted by Scott Mitchell at 10/9/2000 4:32:36 PM to the Dates and Times category. This FAQ has been viewed 80,966 times.

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Last computed at 9/17/2007 3:22:00 AM

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