cdatetime.cs

小型项目组用的工作日志记录系统

using System;

namespace CFC
{
	/// <summary>
	/// CDateTime 的摘要说明。
	/// </summary>
	public class CDateTime
	{
		public CDateTime()
		{
		}

		private static string[] DayOfWeekCaption = new string[] {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};

		public static string DayOfWeek(DateTime dt)
		{
			return DayOfWeekCaption[Convert.ToInt32(dt.DayOfWeek)];
		}

		public static DateTime StartDayOfWeek(DateTime dt)
		{
			return dt.AddDays(-Convert.ToInt32(dt.DayOfWeek));
		}

		public static DateTime EndDayOfWeek(DateTime dt)
		{
			return dt.AddDays(6-Convert.ToInt32(dt.DayOfWeek));
		}

		public static DateTime StartDayOfMonth(DateTime dt)
		{
			return dt.AddDays(1-dt.Day);
		}

		public static DateTime EndDayOfMonth(DateTime dt)
		{
			return StartDayOfMonth(dt.AddMonths(1)).AddDays(-1);
		}
	}
}