【日期】asp.net下日期和时间处理的类库-时间

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asp.net下日期和时间处理的类库

using System;
namespace Utilities
{
/// <summary>
/// Common DateTime Methods.
/// </summary>
///
public enum Quarter
{
First=1,
Second=2,
Third=3,
Fourth=4
}
public enum Month
{
January=1,
February=2,
March=3,
April=4,
May=5,
June=6,
July=7,
August=8,
September=9,
October=10,
November=11,
December=12
}
public class DateUtilities
{
#region Quarter
public static DateTime GetStartOfQuarter( int Year, Quarter Qtr )
{
if( Qtr==Quarter.First ) // 1st Quarter=January 1 to March 31
return new DateTime( Year, 1, 1, 0, 0, 0, 0 );
else if( Qtr==Quarter.Second ) // 2nd Quarter=April 1 to June 30
return new DateTime( Year, 4, 1, 0, 0, 0, 0 );
else if( Qtr==Quarter.Third ) // 3rd Quarter=July 1 to September 30
return new DateTime( Year, 7, 1, 0, 0, 0, 0 );
else // 4th Quarter=October 1 to December 31
return new DateTime( Year, 10, 1, 0, 0, 0, 0 );
}
public static DateTime GetEndOfQuarter( int Year, Quarter Qtr )
{
if( Qtr==Quarter.First ) // 1st Quarter=January 1 to March 31
return new DateTime( Year, 3, DateTime.DaysInMonth( Year, 3 ), 23, 59, 59, 999 );
else if( Qtr==Quarter.Second ) // 2nd Quarter=April 1 to June 30
return new DateTime( Year, 6, DateTime.DaysInMonth( Year, 6 ), 23, 59, 59, 999 );
else if( Qtr==Quarter.Third ) // 3rd Quarter=July 1 to September 30
return new DateTime( Year, 9, DateTime.DaysInMonth( Year, 9 ), 23, 59, 59, 999 );
else // 4th Quarter=October 1 to December 31
return new DateTime( Year, 12, DateTime.DaysInMonth( Year, 12 ), 23, 59, 59, 999 );
}
public static Quarter GetQuarter( Month month )
{
if( month <=Month.March ) // 1st Quarter=January 1 to March 31
return Quarter.First;
else if( ( month >=Month.April ) && ( month <=Month.June ) ) // 2nd Quarter=April 1 to June 30
return Quarter.Second;
else if( ( month >=Month.July ) && ( month <=Month.September ) ) // 3rd Quarter=July 1 to September 30
return Quarter.Third;
else // 4th Quarter=October 1 to December 31
return Quarter.Fourth;
}
public static DateTime GetEndOfLastQuarter()
{
if( DateTime.Now.Month <=(int)Month.March ) //go to last quarter of previous year
return GetEndOfQuarter( DateTime.Now.Year - 1, GetQuarter( Month.December ));
else //return last quarter of current year
return GetEndOfQuarter( DateTime.Now.Year, GetQuarter( (Month)DateTime.Now.Month));
}
public static DateTime GetStartOfLastQuarter()
{
if( DateTime.Now.Month <=3 ) //go to last quarter of previous year
return GetStartOfQuarter( DateTime.Now.Year - 1, GetQuarter( Month.December ));
else //return last quarter of current year
return GetStartOfQuarter( DateTime.Now.Year, GetQuarter( (Month)DateTime.Now.Month));
}
public static DateTime GetStartOfCurrentQuarter()
{
return GetStartOfQuarter( DateTime.Now.Year, GetQuarter( (Month)DateTime.Now.Month ));
}
public static DateTime GetEndOfCurrentQuarter()
{
return GetEndOfQuarter( DateTime.Now.Year, GetQuarter( (Month)DateTime.Now.Month ));
}
#endregion
#region Weeks
public static DateTime GetStartOfLastWeek()
{
int DaysToSubtract=(int)DateTime.Now.DayOfWeek + 7;
DateTime dt=DateTime.Now.Subtract( System.TimeSpan.FromDays( DaysToSubtract ) );
return new DateTime( dt.Year, dt.Month, dt.Day, 0, 0, 0, 0 );
}
public static DateTime GetEndOfLastWeek()
{
DateTime dt=GetStartOfLastWeek().AddDays(6);
return new DateTime( dt.Year, dt.Month, dt.Day, 23, 59, 59, 999 );
}
public static DateTime GetStartOfCurrentWeek()
{
int DaysToSubtract=(int)DateTime.Now.DayOfWeek ;
DateTime dt=DateTime.Now.Subtract( System.TimeSpan.FromDays( DaysToSubtract ) );
return new DateTime( dt.Year, dt.Month, dt.Day, 0, 0, 0, 0 );
}
public static DateTime GetEndOfCurrentWeek()
{
DateTime dt=GetStartOfCurrentWeek().AddDays(6);
return new DateTime( dt.Year, dt.Month, dt.Day, 23, 59, 59, 999 );
}
#endregion
#region Months
public static DateTime GetStartOfMonth( int Month, int Year )
{
return new DateTime( Year, Month, 1, 0, 0, 0, 0 );
}
public static DateTime GetEndOfMonth( int Month, int Year )
{
return new DateTime( Year, Month, DateTime.DaysInMonth( Year, Month ), 23, 59, 59, 999 );
}
public static DateTime GetStartOfLastMonth()
{
if( DateTime.Now.Month==1 )
return GetStartOfMonth( 12, DateTime.Now.Year - 1);
else
return GetStartOfMonth( DateTime.Now.Month -1, DateTime.Now.Year );
}
public static DateTime GetEndOfLastMonth()
{
if( DateTime.Now.Month==1 )
return GetEndOfMonth( 12, DateTime.Now.Year - 1);
else
return GetEndOfMonth( DateTime.Now.Month -1, DateTime.Now.Year );
}
public static DateTime GetStartOfCurrentMonth()
{
return GetStartOfMonth( DateTime.Now.Month, DateTime.Now.Year );
}
public static DateTime GetEndOfCurrentMonth()
{
return GetEndOfMonth( DateTime.Now.Month, DateTime.Now.Year );
}
#endregion
#region Years
public static DateTime GetStartOfYear( int Year )
{
return new DateTime( Year, 1, 1, 0, 0, 0, 0 );
}
public static DateTime GetEndOfYear( int Year )
{
return new DateTime( Year, 12, DateTime.DaysInMonth( Year, 12 ), 23, 59, 59, 999 );
}
public static DateTime GetStartOfLastYear()
{
return GetStartOfYear( DateTime.Now.Year - 1 );
}
public static DateTime GetEndOfLastYear()
{
return GetEndOfYear( DateTime.Now.Year - 1 );
}
public static DateTime GetStartOfCurrentYear()
{
return GetStartOfYear( DateTime.Now.Year );
}
public static DateTime GetEndOfCurrentYear()
{
return GetEndOfYear( DateTime.Now.Year );
}
#endregion
#region Days
public static DateTime GetStartOfDay( DateTime date )
{
return new DateTime( date.Year, date.Month, date.Day, 0, 0, 0, 0 );
}
public static DateTime GetEndOfDay( DateTime date )
{
return new DateTime( date.Year, date.Month, date.Day, 23, 59, 59, 999 );
}
#endregion
}
}

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