DS7/WebSqlHelper/dateHelper.cs

66 lines
2.2 KiB
C#

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

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