Introduction to DATEPART Usage in ASP

DatePart (interval, date[, firstdayofweek[, FirstWeekOfYear])
The syntax for the DatePart function has the following parameters:

Parameter description
Interval must be selected. A string expression that represents the time interval to return. For numeric values, see the "Settings" section.
Date must be selected. The date expression to evaluate.
Firstdayof Week optional. Specifies the constant for the first day of the week. If not specified, the default is Sunday. For numeric values, see the "Settings" section.
FirstWeekOfYear Optional. Specifies a constant for the first week of the year. If not specified, the default is the week of January 1. For numeric values, see the "Settings" section.

' How many days in total are there in a year?

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Function dayofyear (ByVal y) DayOfYear = DatePart ("y",y& "-12-31") End Function5

Example

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Response.Write DayOfYear (2012)