Export (0) Print
Expand All
1 out of 1 rated this helpful - Rate this topic

CalendarWeekRule Enumeration

Defines different rules for determining the first week of the year.

Namespace: System.Globalization
Assembly: mscorlib (in mscorlib.dll)

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public enum CalendarWeekRule
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public enum CalendarWeekRule
SerializableAttribute 
ComVisibleAttribute(true) 
public enum CalendarWeekRule
 Member nameDescription
Supported by the .NET Compact FrameworkFirstDayIndicates that the first week of the year starts on the first day of the year and ends before the following designated first day of the week. The value is 0. 
Supported by the .NET Compact FrameworkFirstFourDayWeekIndicates that the first week of the year is the first week with four or more days before the designated first day of the week. Complies with ISO 8601. The value is 2. 
Supported by the .NET Compact FrameworkFirstFullWeekIndicates that the first week of the year begins on the first occurrence of the designated first day of the week on or after the first day of the year. The value is 1. 

These calendar week rules depend on the System.DayOfWeek value that is designated as the first day of the week. The DateTimeFormatInfo.FirstDayOfWeek property provides the default value for a culture, but any DayOfWeek value can be specified as the first day of the week in the Calendar.GetWeekOfYear method.

The first week based on the FirstDay value can have one to seven days. The first week based on the FirstFullWeek value always has seven days. The first week based on the FirstFourDayWeek value can have four to seven days.

For example, in the Gregorian calendar, suppose that the first day of the year (January 1) falls on a Tuesday and the designated first day of the week is Sunday. Selecting FirstFullWeek defines the first Sunday (January 6) as the beginning of the first week of the year. The first five days of the year are considered part of the last week of the previous year. In contrast, selecting FirstFourDayWeek defines the first day of the year (January 1) as the beginning of the first week of the year because there are more than four days from January 1 to the day before the following Sunday.

Date

FirstDay

FirstFullWeek

FirstFourDayWeek

Dec 31 Mon

Last week of the previous year

Last week of the previous year

Last week of the previous year

Jan 1 Tue

Week 1

Last week of the previous year

Week 1

Jan 2 Wed

Week 1

Last week of the previous year

Week 1

Jan 3 Thu

Week 1

Last week of the previous year

Week 1

Jan 4 Fri

Week 1

Last week of the previous year

Week 1

Jan 5 Sat

Week 1

Last week of the previous year

Week 1

Jan 6 Sun

Week 2

Week 1

Week 2

Jan 7 Mon

Week 2

Week 1

Week 2

Jan 8 Tue

Week 2

Week 1

Week 2

Jan 9 Wed

Week 2

Week 1

Week 2

Jan 10 Thu

Week 2

Week 1

Week 2

Jan 11 Fri

Week 2

Week 1

Week 2

Jan 12 Sat

Week 2

Week 1

Week 2

Suppose the first day of the year (January 1) falls on a Friday and the designated first day of the week is Sunday. Selecting FirstFourDayWeek defines the first Sunday (January 3) as the beginning of the first week of the year because there are fewer than four days from January 1 to the day before the following Sunday.

Date

FirstDay

FirstFullWeek

FirstFourDayWeek

Dec 31 Thu

Last week of the previous year

Last week of the previous year

Last week of the previous year

Jan 1 Fri

Week 1

Last week of the previous year

Last week of the previous year

Jan 2 Sat

Week 1

Last week of the previous year

Last week of the previous year

Jan 3 Sun

Week 2

Week 1

Week 1

Jan 4 Mon

Week 2

Week 1

Week 1

Jan 5 Tue

Week 2

Week 1

Week 1

Jan 6 Wed

Week 2

Week 1

Week 1

Jan 7 Thu

Week 2

Week 1

Week 1

Jan 8 Fri

Week 2

Week 1

Week 1

Jan 9 Sat

Week 2

Week 1

Week 1

Each CultureInfo supports a set of calendars. The Calendar property returns the default calendar for the culture, and the OptionalCalendars property returns an array containing all the calendars supported by the culture. To change the calendar used by a CultureInfo, set the Calendar property of CultureInfo.DateTimeFormat to a new Calendar.

NoteNote

To create a calendar that complies with ISO 8601, use FirstFourDayWeek.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

Community Additions

ADD
Show:
© 2014 Microsoft. All rights reserved.