Date Format Conversion-months, weeks, and days

/// <Summary>
/// Year, month, week, and day String Array
/// </Summary>
/// <Param name = "dt"> date to be converted </param>
/// <Returns> </returns>
Public string [] getYearMonthWeekDayOfDate (DateTime dt)
{
String [] YearMonthWeekDay = new string [4];
YearMonthWeekDay [0] = dt. Year. ToString ();
YearMonthWeekDay [1] = dt. Month. ToString ();
YearMonthWeekDay [2] = "W" + getWeekNumberOfMonth (dt). ToString ();
YearMonthWeekDay [3] = dt. Day. ToString ();
Return YearMonthWeekDay;
}
/// <Summary>
/// Obtain the week number of the date
/// </Summary>
/// <Param name = "dt"> date to be converted </param>
/// <Returns> </returns>
Public int getWeekNumberOfMonth (DateTime dt)
{
DateTime monthStartDate = DateTime. Parse (dt. Year. ToString () + "-" + dt. Month. ToString () + "-" + "01 ");
DateTime monthEndDate = monthStartDate. AddMonths (1 );
Int difference = getWeekDifference (monthStartDate. DayOfWeek. ToString (), "Sunday ");
If (dt <= monthStartDate. AddDays (difference) & dt <= monthEndDate)
{
Return 1;
}
Else if (dt <monthStartDate. AddDays (difference + 7 + 1) & dt <monthEndDate)
{
Return 2;
}
Else if (dt <monthStartDate. AddDays (difference + 7*2 + 1) & dt <monthEndDate)
{
Return 3;
}
Else if (dt <monthStartDate. AddDays (difference + 7*3 + 1) & dt <monthEndDate)
{
Return 4;
}
Else if (dt <monthStartDate. AddDays (difference + 7*4 + 1) & dt <monthEndDate)
{
Return 5;
}
Else
{
Return 6;
}
}
/// <Summary>
/// If the result is less than-7 or greater than 7, the input parameter is incorrect.
/// </Summary>
/// <Param name = "start"> start DayOfWeek </param>
/// <Param name = "end"> end DayOfWeek </param>
/// <Returns> </returns>
Public int getWeekDifference (string start, string end)
{
Int difference = getWeek (end)-getWeek (start );
Return difference;
}
/// <Summary>
/// Convert DayOfWeek to week
/// </Summary>
/// <Param name = "strWeek"> DayOfWeek </param>
/// <Returns> </returns>
Public week getWeek (string strWeek)
{
Switch (strWeek)
{
Case "Sunday ":
Return week. Sunday;
Case "Monday ":
Return week. Monday;
Case "Tuesday ":
Return week. Tuesday;
Case "Wednesday ":
Return week. Wednesday;
Case "Thursday ":
Return week. Thursday;
Case "Friday ":
Return week. Friday;
Case "Saturday ":
Return week. Saturday;
Default:
Return week. Wrong;
}
}
Public enum week
{
/// <Summary>
/// Sunday
/// </Summary>
Sunday = 7,
/// <Summary>
/// Monday
/// </Summary>
Monday = 1,

/// <Summary>
/// Tuesday
/// </Summary>
Tuesday = 2,

/// <Summary>
/// Wednesday
/// </Summary>
Wednesday = 3,

/// <Summary>
/// Thursday
/// </Summary>
Thursday = 4,

/// <Summary>
/// Friday
/// </Summary>
Friday = 5,

/// <Summary>
/// Saturday
/// </Summary>
Saturday = 6,
/// <Summary>
///
/// </Summary>
Wrong = 0,
}