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using System;
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using System.Collections.Generic;
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//using System.Linq;
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using System.Text;
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namespace WebSqlHelper
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{
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public class DateHelper
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{
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public static string dateFormat(string date, string format)
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{
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string str = "";
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if (!string.IsNullOrEmpty(date))
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{
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try
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{
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str = DateTime.Parse(date).ToString(format);
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}
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catch
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{ }
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}
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return str;
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}
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/// <summary>
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/// 计算本周的周一日期
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/// </summary>
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/// <returns></returns>
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public static DateTime GetMondayDate()
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{
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return GetMondayDate(DateTime.Now);
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}
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/// <summary>
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/// 计算本周周日的日期
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/// </summary>
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/// <returns></returns>
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public static DateTime GetSundayDate()
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{
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return GetSundayDate(DateTime.Now);
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}
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/// <summary>
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/// 计算某日起始日期(礼拜一的日期)
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/// </summary>
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/// <param name="someDate">该周中任意一天</param>
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/// <returns>返回礼拜一日期,后面的具体时、分、秒和传入值相等</returns>
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public static DateTime GetMondayDate(DateTime someDate)
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{
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int i = someDate.DayOfWeek - DayOfWeek.Monday;
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if (i == -1) i = 6;// i值 > = 0 ,因为枚举原因,Sunday排在最前,此时Sunday-Monday=-1,必须+7=6。
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TimeSpan ts = new TimeSpan(i, 0, 0, 0);
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return someDate.Subtract(ts);
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}
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/// <summary>
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/// 计算某日结束日期(礼拜日的日期)
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/// </summary>
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/// <param name="someDate">该周中任意一天</param>
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/// <returns>返回礼拜日日期,后面的具体时、分、秒和传入值相等</returns>
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public static DateTime GetSundayDate(DateTime someDate)
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{
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int i = someDate.DayOfWeek - DayOfWeek.Sunday;
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if (i != 0) i = 7 - i;// 因为枚举原因,Sunday排在最前,相减间隔要被7减。
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TimeSpan ts = new TimeSpan(i, 0, 0, 0);
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return someDate.Add(ts);
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}
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}
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}
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