代码如下:
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()
