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11/18/2011

TaiwanCalendar Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents the Taiwan calendar.

Inheritance Hierarchy

System.Object
System.Globalization.Calendar
System.Globalization.TaiwanCalendar

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

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Class TaiwanCalendar _
    Inherits Calendar

[ComVisibleAttribute(true)]
public class TaiwanCalendar : Calendar

The TaiwanCalendar type exposes the following members.

Constructors

	Name	Description
	TaiwanCalendar	Initializes a new instance of the TaiwanCalendar class.

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Properties

	Name	Description
	Eras	Gets the list of eras in the TaiwanCalendar. (Overrides Calendar.Eras.)
	IsReadOnly	Gets a value indicating whether this Calendar object is read-only. (Inherited from Calendar.)
	MaxSupportedDateTime	Gets the latest date and time supported by the TaiwanCalendar class. (Overrides Calendar.MaxSupportedDateTime.)
	MinSupportedDateTime	Gets the earliest date and time supported by the TaiwanCalendar class. (Overrides Calendar.MinSupportedDateTime.)
	TwoDigitYearMax	Gets or sets the last year of a 100-year range that can be represented by a 2-digit year. (Overrides Calendar.TwoDigitYearMax.)

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Methods

	Name	Description
	AddDays	Returns a DateTime that is the specified number of days away from the specified DateTime. (Inherited from Calendar.)
	AddHours	Returns a DateTime that is the specified number of hours away from the specified DateTime. (Inherited from Calendar.)
	AddMilliseconds	Returns a DateTime that is the specified number of milliseconds away from the specified DateTime. (Inherited from Calendar.)
	AddMinutes	Returns a DateTime that is the specified number of minutes away from the specified DateTime. (Inherited from Calendar.)
	AddMonths	Returns a DateTime that is the specified number of months away from the specified DateTime. (Overrides Calendar.AddMonths(DateTime, Int32).)
	AddSeconds	Returns a DateTime that is the specified number of seconds away from the specified DateTime. (Inherited from Calendar.)
	AddWeeks	Returns a DateTime that is the specified number of weeks away from the specified DateTime. (Inherited from Calendar.)
	AddYears	Returns a DateTime that is the specified number of years away from the specified DateTime. (Overrides Calendar.AddYears(DateTime, Int32).)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetDayOfMonth	Returns the day of the month in the specified DateTime. (Overrides Calendar.GetDayOfMonth(DateTime).)
	GetDayOfWeek	Returns the day of the week in the specified DateTime. (Overrides Calendar.GetDayOfWeek(DateTime).)
	GetDayOfYear	Returns the day of the year in the specified DateTime. (Overrides Calendar.GetDayOfYear(DateTime).)
	GetDaysInMonth(Int32, Int32)	Returns the number of days in the specified month and year of the current era. (Inherited from Calendar.)
	GetDaysInMonth(Int32, Int32, Int32)	Returns the number of days in the specified month in the specified year in the specified era. (Overrides Calendar.GetDaysInMonth(Int32, Int32, Int32).)
	GetDaysInYear(Int32)	Returns the number of days in the specified year of the current era. (Inherited from Calendar.)
	GetDaysInYear(Int32, Int32)	Returns the number of days in the specified year in the specified era. (Overrides Calendar.GetDaysInYear(Int32, Int32).)
	GetEra	Returns the era of a specified DateTime value. (Overrides Calendar.GetEra(DateTime).)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetHour	Returns the hours value in the specified DateTime. (Inherited from Calendar.)
	GetLeapMonth	Calculates the leap month for a specified year and era. (Overrides Calendar.GetLeapMonth(Int32, Int32).)
	GetMilliseconds	Returns the milliseconds value in the specified DateTime. (Inherited from Calendar.)
	GetMinute	Returns the minutes value in the specified DateTime. (Inherited from Calendar.)
	GetMonth	Returns the month in the specified DateTime. (Overrides Calendar.GetMonth(DateTime).)
	GetMonthsInYear(Int32)	Returns the number of months in the specified year in the current era. (Inherited from Calendar.)
	GetMonthsInYear(Int32, Int32)	Returns the number of months in the specified year in the specified era. (Overrides Calendar.GetMonthsInYear(Int32, Int32).)
	GetSecond	Returns the seconds value in the specified DateTime. (Inherited from Calendar.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetWeekOfYear	Returns the week of the year that includes the date in the specified DateTime. (Overrides Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek).)
	GetYear	Returns the year in the specified DateTime. (Overrides Calendar.GetYear(DateTime).)
	IsLeapDay(Int32, Int32, Int32)	Determines whether the specified date in the current era is a leap day. (Inherited from Calendar.)
	IsLeapDay(Int32, Int32, Int32, Int32)	Determines whether the specified date in the specified era is a leap day. (Overrides Calendar.IsLeapDay(Int32, Int32, Int32, Int32).)
	IsLeapMonth(Int32, Int32)	Determines whether the specified month in the specified year in the current era is a leap month. (Inherited from Calendar.)
	IsLeapMonth(Int32, Int32, Int32)	Determines whether the specified month in the specified year in the specified era is a leap month. (Overrides Calendar.IsLeapMonth(Int32, Int32, Int32).)
	IsLeapYear(Int32)	Determines whether the specified year in the current era is a leap year. (Inherited from Calendar.)
	IsLeapYear(Int32, Int32)	Determines whether the specified year in the specified era is a leap year. (Overrides Calendar.IsLeapYear(Int32, Int32).)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32)	Returns a DateTime that is set to the specified date and time in the current era. (Inherited from Calendar.)
	ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32)	Returns a DateTime that is set to the specified date and time in the specified era. (Overrides Calendar.ToDateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32).)
	ToFourDigitYear	Converts the specified year to a four-digit year by using the TwoDigitYearMax property to determine the appropriate century. (Overrides Calendar.ToFourDigitYear(Int32).)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The Taiwan calendar works exactly like the Gregorian calendar, except that the year and era are different. The TaiwanCalendar class recognizes only the current era.

Leap years in the Taiwan calendar correspond to the same leap years in the Gregorian calendar. A leap year in the Gregorian calendar is defined as a Gregorian year that is evenly divisible by four, except if it is divisible by 100. However, Gregorian years that are divisible by 400 are leap years. A common year has 365 days and a leap year has 366 days.

The Taiwan calendar has 12 months with 28 to 31 days each:

GetMonth value	Month	Days in common years	Days in leap years
1	1月 (January)	31	31
2	2月 (February)	28	29
3	3月 (March)	31	31
4	4月 (April)	30	30
5	5月 (May)	31	31
6	6月 (June)	30	30
7	7月 (July)	31	31
8	8月 (August)	31	31
9	9月 (September)	30	30
10	10月 (October)	31	31
11	11月 (November)	30	30
12	12月 (December)	31	31

February has 29 days during leap years and 28 during common years.

The date January 1, 2001 C.E. in the Gregorian calendar is equivalent to the first day of January in the year 90 of the current era in the Taiwan calendar.

Each CultureInfo object supports a set of calendars. The CultureInfo.Calendar property returns the default calendar for the culture, and the CultureInfo.OptionalCalendars property returns an array containing all the calendars supported by the culture. To change the calendar used by a CultureInfo object, the application should set the DateTimeFormatInfo.Calendar property of CultureInfo.DateTimeFormat to a new Calendar object if the new calendar is one of the culture's optional calendars. The following example shows how to change the calendar for the zh-TW culture to the Taiwan calendar.

' Change the calendar used by a zh-TW CultureInfo object from Gregorian to Taiwan. 
Dim taiwanCulture As New CultureInfo("zh-TW")
Dim originalCalendar As Calendar = taiwanCulture.Calendar
Dim message As String = Nothing

' Confirm that the default calendar is not the Taiwan calendar.
If originalCalendar.ToString <> "System.Globalization.TaiwanCalendar" Then
   ' Check whether the culture supports the Taiwan calendar.
   Dim supported As Boolean = False
   For Each supportedCal As Calendar In taiwanCulture.OptionalCalendars
      If supportedCal.ToString = "System.Globalization.TaiwanCalendar" Then
         supported = True            
         taiwanCulture.DateTimeFormat.Calendar = supportedCal
         message = String.Format("Changed the current calendar for the {0} culture from {1} to {2}.", _
                                 taiwanCulture.ToString(), _
                                 originalCalendar.ToString.Replace("System.Globalization.", ""), _
                                 supportedCal.ToString.Replace("System.Globalization.", ""))                                 
         Exit For
      End If
      If Not supported Then message = "The Taiwan calendar is not supported."
   Next        
Else
   message = String.Format("Taiwan is the default calendar for the {0} culture.", _
                           taiwanCulture.ToString())
End If
outputBlock.Text += message + vbCrLf
' The example displays the following output:
'   Changed the current calendar for the zh-TW culture from GregorianCalendar to TaiwanCalendar.

// Change the calendar used by a zh-TW CultureInfo object from Gregorian to Taiwan. 
CultureInfo taiwanCulture = new CultureInfo("zh-TW");
Calendar originalCalendar = taiwanCulture.Calendar;
string message = null;

// Confirm that the default calendar is not the Taiwan calendar.
if (originalCalendar.ToString() != "System.Globalization.TaiwanCalendar")
{
   // Check whether the culture supports the Taiwan calendar.
   bool supported = false;
   foreach (Calendar supportedCal in taiwanCulture.OptionalCalendars)
{
      if (supportedCal.ToString() == "System.Globalization.TaiwanCalendar")
      {
         supported = true;            
         taiwanCulture.DateTimeFormat.Calendar = supportedCal;
         message = String.Format("Changed the current calendar for the {0} culture from {1} to {2}.",
                                 taiwanCulture.ToString(),
                                 originalCalendar.ToString().Replace("System.Globalization.", ""),
                                 supportedCal.ToString().Replace("System.Globalization.", ""));                                 
         break;
      }
      if (! supported) message = "The Taiwan calendar is not supported.";
   }        
   if (! supported) message = "The Taiwan calendar is not supported.";
}
else
{
   message = String.Format("Taiwan is the default calendar for the {0} culture.",
                           taiwanCulture.ToString());
}
outputBlock.Text += message + "\n";
// The example displays the following output:
//   Changed the current calendar for the zh-TW culture from GregorianCalendar to TaiwanCalendar.

Platform Notes

Silverlight for Windows Phone

This type is present but is not currently supported on Windows Phone.

Notes to Callers

If DateTimeFormatInfo.Calendar is the TaiwanCalendar but the Thread.CurrentCulture is not "zh-TW", then DateTimeFormatInfo.GetEraName and DateTimeFormatInfo.GetAbbreviatedEraName return an empty string ("").

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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