C#判断两个日期是否在同一周，某日期是本月的第几周
/// <summary>
/// 判断两个日期是否在同一周
/// </summary>
/// <param name="dtmS">开始日期</param>
/// <param name="dtmE">结束日期</param>
/// <returns></returns>
private
bool
IsInSameWeek(DateTime dtmS, DateTime dtmE)
{
TimeSpan ts = dtmE - dtmS;
double
dbl = ts.TotalDays;
int
intDow = Convert.ToInt32(dtmE.DayOfWeek);
if
(intDow == 0) intDow = 7;
if
(dbl >= 7 || dbl >= intDow)
return
false
;
else
return
true
;
}
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/// <summary>
/// 某日期是本月的第几周
/// </summary>
/// <param name="dtSel"></param>
/// <param name="sundayStart"></param>
/// <returns></returns>
private
int
WeekOfMonth(DateTime dtSel,
bool
sundayStart)
{
//如果要判断的日期为1号，则肯定是第一周了
if
(dtSel.Day == 1)
return
1;
else
{
//得到本月第一天
DateTime dtStart =
new
DateTime
(dtSel.Year, dtSel.Month, 1);
//得到本月第一天是周几
int
dayofweek = (
int
)dtStart.DayOfWeek;
//如果不是以周日开始，需要重新计算一下
//dayofweek，详细风DayOfWeek枚举的定义
if
(!sundayStart)
{
dayofweek = dayofweek - 1;
if
(dayofweek < 0) dayofweek = 7;
}
//得到本月的第一周一共有几天
int
startWeekDays = 7 - dayofweek;
//如果要判断的日期在第一周范围内，返回1
if
(dtSel.Day <= startWeekDays)
return
1;
else
{
int
aday = dtSel.Day + 7 - startWeekDays;
return
aday / 7 + (aday % 7 > 0 ? 1 : 0);
}
}
}
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