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VBScript DateDiff Function

The DateDiff function returns the number of intervals between two dates."

Examples

Example 1

The difference between January 31 2009, and January 31 2010:

<%

fromDate="31-Jan-09 00:00:00"
toDate="31-Jan-10 23:59:00"
response.write(DateDiff("yyyy",fromDate,toDate) & "<br />")
response.write(DateDiff("q",fromDate,toDate) & "<br />")
response.write(DateDiff("m",fromDate,toDate) & "<br />")
response.write(DateDiff("y",fromDate,toDate) & "<br />")
response.write(DateDiff("d",fromDate,toDate) & "<br />")
response.write(DateDiff("w",fromDate,toDate) & "<br />")
response.write(DateDiff("ww",fromDate,toDate) & "<br />")
response.write(DateDiff("h",fromDate,toDate) & "<br />")
response.write(DateDiff("n",fromDate,toDate) & "<br />")
response.write(DateDiff("s",fromDate,toDate) & "<br />")

%>

The output of the code above will be:

1
4
12
365
365
52
53
8783
527039
31622340

Example 2

How many weeks (start on Monday),
between December 31 2009 and December 31 2012:

<%

fromDate=CDate("2009/12/31")
toDate=CDate("2012/12/31")
response.write(DateDiff("w",fromDate,toDate,vbMonday))

%>

The output of the code above will be:

156

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