VB.NET Language in a Nutshell, Second Edition

Name

Day Function

Class

Microsoft.VisualBasic.DateAndTime

Syntax

Day(datevalue)

datevalue (required; Date or literal date)

Return Value

An Integer from 1 to 31, representing the day of the month

Description

Returns an Integer ranging from 1 to 31, representing the day of the month of datevalue

Rules at a Glance

The range of datevalue is 1/1/1 to 12/31/9999.

Programming Tips and Gotchas

• When working with dates, always check that a date is valid using the IsDate function prior to passing it as a function parameter.

• With Option Strict On, you must first convert datevalue to a Date data type before passing it to the Day function. You can use the CDate function for this purpose.

• If the day portion of datevalue is outside of its valid range, the function regenerates runtime error 13, “Type mismatch.” This is also true if the day and month portion of datevalue is 2/29 for a non-leap year.

• To return the day of the week, use the WeekDay function.

See Also

DatePart Function, WeekdayName Function