判断日期是否是今天、本周、本月、本年函数代码,CSharp代码库,德仔网

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【CSharp】判断日期是否是今天、本周、本月、本年函数

作者:Dezai.CN / 发布于2012/2/7/ 574

<div>
/// <summary>
/// 判断选择的日期是否是本周
///  </summary>
/// <param  name="someDate"></param>
///  <returns></returns>
public static bool  IsThisWeek(DateTime someDate)
{
DateTime dt =  DateTime.Now;
DateTime nowMon = dt.AddDays(1 -  Convert.ToInt32(dt.DayOfWeek.ToString("d"))); 

TimeSpan ts = someDate - nowMon;
if (ts.Days >= 0 && ts.Days < 7)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 判断选择的日期是否是本月
///  </summary>
/// <param  name="someDate"></param>
///  <returns></returns>
public static bool  IsThisMonth(DateTime someDate)
{
DateTime dt =  DateTime.Now;
DateTime nowMonth = dt.AddDays(1 - dt.Day);
DateTime endMonth = nowMonth.AddMonths(1).AddDays(-1);
TimeSpan  ts1 = someDate - nowMonth;
TimeSpan ts2 = endMonth -  someDate;
if (ts1.Days >= 0 && ts2.Days >=  0)
{
return true;
}
else
{
return  false;
}
}
/// <summary>
/// 判断选择的日期是否是今天
///  </summary>
/// <param  name="someDate"></param>
///  <returns></returns>
public static bool IsToday(DateTime  someDate)
{
DateTime dt =  Convert.ToDateTime(  DateTime.Now.ToShortDateString() );
TimeSpan ts = someDate -  dt;
if (ts.Days == 0)
{
return  true;
}
else
{
return false;
}
}
/// <summary>
/// 判断选择的日期是否是本年
///  </summary>
/// <param  name="someDate"></param>
///  <returns></returns>
public static bool  IsThisYear(DateTime someDate)
{
DateTime dt =  DateTime.Now;
DateTime startYear = new DateTime(dt.Year, 1, 1);   
DateTime endYear = new DateTime(dt.Year, 12, 31);
TimeSpan ts1 = someDate - startYear;
TimeSpan ts2  = endYear - someDate;
if (ts1.Days >= 0 && ts2.Days  >= 0)
{
return true;
}
else
{
return  false;
}

}
</div>

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　判断日期　

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