DateTime Constructor (Int32, Int32, Int32, Int32, Int32, Int32, Int32, Calendar)

July 28, 2014

Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, second, and millisecond for the specified calendar.

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

'Declaration
Public Sub New ( _
	year As Integer, _
	month As Integer, _
	day As Integer, _
	hour As Integer, _
	minute As Integer, _
	second As Integer, _
	millisecond As Integer, _
	calendar As Calendar _
)

Parameters

year
Type: System.Int32
The year (1 through the number of years in calendar).
month
Type: System.Int32
The month (1 through the number of months in calendar).
day
Type: System.Int32
The day (1 through the number of days in month).
hour
Type: System.Int32
The hours (0 through 23).
minute
Type: System.Int32
The minutes (0 through 59).
second
Type: System.Int32
The seconds (0 through 59).
millisecond
Type: System.Int32
The milliseconds (0 through 999).
calendar
Type: System.Globalization.Calendar
The calendar to use to interpret year, month, and day.

ExceptionCondition
ArgumentNullException

calendar is Nothing.

ArgumentOutOfRangeException

year is not in the range supported by calendar.

-or-

month is less than 1 or greater than the number of months in calendar.

-or-

day is less than 1 or greater than the number of days in month.

-or-

hour is less than 0 or greater than 23.

-or-

minute is less than 0 or greater than 59.

-or-

second is less than 0 or greater than 59.

-or-

millisecond is less than 0 or greater than 999.

The Kind property is initialized to Unspecified.

The allowable values for year, month, and day depend on calendar. An exception is thrown if the specified date and time cannot be expressed by using calendar.

For applications in which a limited degree of time zone awareness is important, you can use the corresponding DateTimeOffset constructor.

The System.Globalization namespace provides several calendars, including GregorianCalendar, HebrewCalendar, HijriCalendar, and JapaneseCalendar.

The following example calls the DateTime(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Calendar) constructor to instantiate a DateTime value by using a HijriCalendar object. The DateTime in the Hijri calendar is then displayed in two different ways. Because the current culture may not support the Hijri calendar, the date in the Hijri calendar is displayed by making individual calls to its HijriCalendar.GetMonth, HijriCalendar.GetDayOfMonth, and HijriCalendar.GetYear methods. The example then changes the current culture to Arabic (Syria) and changes the current culture's default calendar to the Hijri calendar. Because Hijri is now the current culture's default calendar, the ToString(String, IFormatProvider) method, which is called implicitly by the String.Format method, uses it to format the date. When the previous current culture (which is English (United States) in this case) is restored, the ToString(String, IFormatProvider) method uses the current culture's default Gregorian calendar to format the date.


Imports System.Globalization
Imports System.Text.RegularExpressions
Imports System.Threading

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Define Hijri calendar.
      Dim hijri As New HijriCalendar()
      ' Define a date using the Hijri calendar.
      Dim date1 As New Date(1431, 9, 9, 16, 32, 18, 500, hijri)

      outputBlock.Text &= "Using the Hijri Calendar with the Default Culture:" & vbCrLf
      outputBlock.Text &= date1.ToString("M/dd/yyyy h:mm:ss.fff tt") & vbCrLf
      outputBlock.Text += String.Format("{0}/{1}/{2} {3}:{4:D2}:{5:D2}.{6:G3}", _
                                        hijri.GetMonth(date1), _
                                        hijri.GetDayOfMonth(date1), _
                                        hijri.GetYear(date1), _
                                        hijri.GetHour(date1), _
                                        hijri.GetMinute(date1), _
                                        hijri.GetSecond(date1), _
                                        hijri.GetMilliseconds(date1)) & vbCrLf
      outputBlock.Text &= vbCrLf

      ' Get current culture so it can later be restored.
      Dim dftCulture As CultureInfo = Thread.CurrentThread.CurrentCulture

      ' Define strings for use in composite formatting.
      Dim dFormat As String
      Dim fmtString As String

      ' Make ar-SY the current culture and Hijri the current calendar.
      Thread.CurrentThread.CurrentCulture = New CultureInfo("ar-SY")
      Dim current As CultureInfo = CultureInfo.CurrentCulture
      current.DateTimeFormat.Calendar = hijri
      dFormat = current.DateTimeFormat.ShortDatePattern
      ' Ensure year is displayed as four digits.
      dFormat = Regex.Replace(dFormat, "/yy$", "/yyyy") + " H:mm:ss.fff"
      fmtString = "{0} culture using the {1} calendar: {2:" + dFormat + "}"
      outputBlock.Text &= String.Format(fmtString, current, GetCalendarName(hijri), date1) & vbCrLf

      ' Restore previous culture.
      Thread.CurrentThread.CurrentCulture = dftCulture
      dFormat = DateTimeFormatInfo.CurrentInfo.ShortDatePattern + " H:mm:ss.fff"
      fmtString = "{0} culture using the {1} calendar: {2:" + dFormat + "}"
      outputBlock.Text += String.Format(fmtString, CultureInfo.CurrentCulture, _
                        GetCalendarName(CultureInfo.CurrentCulture.Calendar), _
                        date1) & vbCrLf
   End Sub

   Private Function GetCalendarName(ByVal cal As Calendar) As String
      Return Regex.Match(cal.ToString(), "\.(\w+)Calendar").Groups(1).Value
   End Function
End Module
' The example displays the following output:
'       Using the Persian Calendar:
'       8/18/2010 4:32:18.500 PM
'       5/27/1389 16:32:18.500
'       
'       Using the Hijri Calendar:
'       ar-SY culture using the Hijri calendar: 09/09/1431 16:32:18.500
'       en-US culture using the Gregorian calendar: 8/18/2010 16:32:18.500


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Supported in: 8.1, 8.0, 7.1, 7.0

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