April 2002
Intermediate to advanced
688 pages
19h 51m
English
Content preview from VB.NET Language in a Nutshell, Second Edition
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Name
Weekday Function
Class
Microsoft.VisualBasic.DateAndTime
Syntax
Weekday(datevalue, [dayofweek])
-
date(required; Date or valid date expression) Any valid date expression
-
dayofweek (optional; Constant of
FirstDayOfWeekenumeration) A constant indicating the first day of the week
Return Value
Integer
Description
Determines the day of the week of a given date
Rules at a Glance
The default for dayofweek is FirstDayOfWeek.Sunday.
To determine the day of the week, think of the day specified by
dayofweekas day 1, and the value returned by the function as indicating the day relative to day 1. Then, for example, if the return value of WeekDay is 2, this specifies the day followingdayofweek. A return value of 1 specifiesdayofweek. A return value of 7 specifies the day beforedayofweek.The members of the
FirstDayOfWeekenumeration are:
|
Constant |
Value |
Description |
|---|---|---|
Sunday |
1 |
Sunday |
Monday |
2 |
Monday |
Tuesday |
3 |
Tuesday |
Wednesday |
3 |
Wednesday |
Thursday |
4 |
Thursday |
Friday |
5 |
Friday |
Saturday |
6 |
Saturday |
Sunday |
7 |
Sunday |
Passing a value of 0 as the
dayofweekargument uses the system’s locale settings to determine the first day of the week.
Example
Since the code:
Weekday(#3/26/2001#, FirstDayOfWeek.Sunday)
returns 2, the date 3/26/2001 is a Monday.
Programming Tips and Gotchas
If passing a date literal as datevalue,
the Weekday function requires that all four
digits of the year be present.
VB.NET/VB 6 Differences
The names of the named parameters of the function have changed from
date and ...
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