c# 计算两日期的工作时间间隔(排除非工作日)及计算下一个工作时间点.

一个日期段如工作时间为 8:00 至 17：00

public class TimeHelper
{

/// <summary>
/// 计算时间间隔
/// </summary>
/// <param name="tsStart"></param>
/// <param name="tsEnd"></param>
/// <param name="time_start"></param>
/// <param name="time_end"></param>
/// <returns></returns>
public static TimeSpan GetTimeSpan(TimeSpan tsStart, TimeSpan tsEnd, TimeSpan time_start, TimeSpan time_end)
{
if (tsStart > tsEnd)
return new TimeSpan(0);

if (tsEnd < time_start)
return new TimeSpan(0);

if (tsStart > time_end)
return new TimeSpan(0);

if (tsStart >= time_start && tsStart <= time_end)
time_start = tsStart;

if (tsEnd <= time_end && tsEnd >= time_start)
time_end = tsEnd;

return time_end - time_start;
}
/// <summary>
/// 获取两日期的工作时间间隔
/// </summary>
/// <param name="dtStart"></param>
/// <param name="dtEnd"></param>
/// <param name="time_start"></param>
/// <param name="time_end"></param>
/// <returns></returns>
public static TimeSpan GetDateTimeSpan(DateTime dtStart, DateTime dtEnd, TimeSpan time_start, TimeSpan time_end)
{
if (dtStart.Date == dtEnd.Date) //如果是同一天
{
if (IsWorkDay(dtStart))
return GetTimeSpan(dtStart.TimeOfDay, dtEnd.TimeOfDay, time_start, time_end);
else
return new TimeSpan(0);
}
//如果不是同一天 计算天数减去1 乘以标准时长 加上分别计算开始开数和结束天数
double days = dtEnd.Date.Subtract(dtStart.Date).TotalDays - 1;

TimeSpan startTimeSpan;
if (IsWorkDay(dtStart))
startTimeSpan = GetTimeSpan(dtStart.TimeOfDay, new TimeSpan(23, 59, 60), time_start, time_end);//开始天
else
startTimeSpan = new TimeSpan(0);

TimeSpan endTimeSpan;
if (IsWorkDay(dtEnd))
endTimeSpan = GetTimeSpan(new TimeSpan(0, 0, 0), dtEnd.TimeOfDay, time_start, time_end);//结束天
else
endTimeSpan = new TimeSpan(0);

TimeSpan totalTimeSpan = startTimeSpan + endTimeSpan; //总值

TimeSpan preTimeSpan = time_end - time_start;
for (int i = 1; i <=days; i++)
{
if (IsWorkDay(dtStart.AddDays(i)))
totalTimeSpan += preTimeSpan; //添加间隔天
}

return totalTimeSpan;
}
/// <summary>
/// 判断是否为工作日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static bool IsWorkDay(DateTime dt)
{
//先从日期表中，查找不是上班时间，如果不是直接返回 false ，如果是，直接返回 true。
//如果在日期表中，找不到，则查找定义的日历，依据日历定义的周末时间来定义是否为工作日。
//获取日历中不上班的标准周末时间,判断是不是上班时间
if (dt.DayOfWeek == DayOfWeek.Sunday || dt.DayOfWeek == DayOfWeek.Saturday)
return false;
else
return true;
}
/// <summary>
/// 给定时间点加上时间间隔后得出新的时间
/// </summary>
/// <param name="startDate"></param>
/// <param name="exTimeSpan"></param>
/// <param name="time_start"></param>
/// <param name="time_end"></param>
/// <returns></returns>
public static DateTime GetDateTime(DateTime startDate, TimeSpan exTimeSpan, TimeSpan time_start, TimeSpan time_end)
{
TimeSpan t_span = exTimeSpan;
//初始到工作日
while (!IsWorkDay(startDate))
startDate = startDate.AddDays(1);
//初始到起始时间
if (startDate.TimeOfDay < time_start)
startDate = startDate - startDate.TimeOfDay + time_start;

if (startDate.TimeOfDay > time_end)
{
startDate = startDate.AddDays(1);
startDate = startDate - startDate.TimeOfDay + time_start;

//初始到工作日
while (!IsWorkDay(startDate))
startDate = startDate.AddDays(1);
}
//计算本天结束剩余多少天
TimeSpan tmpTs = GetTimeSpan(startDate.TimeOfDay, time_end, time_start, time_end);

//剩余时长
exTimeSpan = exTimeSpan - tmpTs;
//如果计算后剩余小于零 直接返回
if (exTimeSpan < new TimeSpan(0))
return startDate + t_span;

//如果计算后大于零，继续新增1天.
TimeSpan preDayTimeSpan = time_end - time_start;
do
{
do
{
startDate = startDate.AddDays(1);
} while (!IsWorkDay(startDate));

if (exTimeSpan > preDayTimeSpan)
exTimeSpan -= preDayTimeSpan;
else
break;

} while (exTimeSpan > new TimeSpan(0));

startDate = startDate - startDate.TimeOfDay + time_start; //把计算得出的当天值为初始时间如早上8:00

return startDate + exTimeSpan;
}
}

二段工作时间：如 8:00至12:00 13:00 至17:00

public class TimeHelper2
{
public static TimeSpan GetDateTimeSpan(DateTime dtStart, DateTime dtEnd, TimeSpan time_start, TimeSpan time_end, TimeSpan time_start2, TimeSpan time_end2)
{
if (dtStart.Date == dtEnd.Date) //如果是同一天
{
if (IsWorkDay(dtStart))
return GetTimeSpan(dtStart.TimeOfDay, dtEnd.TimeOfDay, time_start, time_end, time_start2, time_end2);
else
return new TimeSpan(0);
}
//如果不是同一天 计算天数减去1 乘以标准时长 加上分别计算开始开数和结束天数
double days = dtEnd.Date.Subtract(dtStart.Date).TotalDays - 1;

TimeSpan startTimeSpan;
if (IsWorkDay(dtStart))
startTimeSpan = GetTimeSpan(dtStart.TimeOfDay, new TimeSpan(23, 59, 60), time_start, time_end, time_start2, time_end2);//开始天
else
startTimeSpan = new TimeSpan(0);

TimeSpan endTimeSpan;
if (IsWorkDay(dtEnd))
endTimeSpan = GetTimeSpan(new TimeSpan(0, 0, 0), dtEnd.TimeOfDay, time_start, time_end, time_start2, time_end2);//结束天
else
endTimeSpan = new TimeSpan(0);

TimeSpan totalTimeSpan = startTimeSpan + endTimeSpan; //总值

TimeSpan preTimeSpan = GetTimeSpan(new TimeSpan(0, 0, 0), new TimeSpan(23, 59, 60), time_start, time_end, time_start2, time_end2);//开始天
for (int i = 1; i <= days; i++)
{
if (IsWorkDay(dtStart.AddDays(i)))
totalTimeSpan += preTimeSpan; //添加间隔天
}

return totalTimeSpan;
}

/// <summary>
/// 判断是否为工作日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static bool IsWorkDay(DateTime dt)
{
//先从日期表中，查找不是上班时间，如果不是直接返回 false ，如果是，直接返回 true。
//如果在日期表中，找不到，则查找定义的日历，依据日历定义的周末时间来定义是否为工作日。
//获取日历中不上班的标准周末时间,判断是不是上班时间
if (dt.DayOfWeek == DayOfWeek.Sunday || dt.DayOfWeek == DayOfWeek.Saturday)
return false;
else
return true;
}

//同一天获取
public static TimeSpan GetTimeSpan(TimeSpan tsStart, TimeSpan tsEnd, TimeSpan time_start, TimeSpan time_end, TimeSpan time_start2, TimeSpan time_end2)
{

//判断 开始时间
if (tsStart < time_start)
{
//标准开始时间不变
//start1 不变
//start2 不变
}
else if (tsStart >= time_start && tsStart <= time_end)
{
//标准开始= dtStart
time_start = tsStart;
//start1 变
//start2 不变
}
else if (tsStart > time_end && tsStart < time_start2)
{
time_start = time_end;
//start1 变
//start2 不变
}
else if (tsStart >= time_start2 && tsStart <= time_end2)
{
time_start = time_end;
time_start2 = tsStart;
//start1 变
//start2 变
}
else if (tsStart > time_end2)
{
time_start = time_end;
time_start2 = time_end2;
//start1 变
//start2 变
}

//判断 结束时间
if (tsEnd < time_start)
{
//标准开始时间不变
time_end = time_start;
time_end2 = time_start2;
//time_end 变
//time_end2变
}
else if (tsEnd >= time_start && tsEnd <= time_end)
{
time_end = tsEnd;
time_end2 = time_start2;
//time_end 变
//time_end2变
}
else if (tsEnd > time_end && tsEnd < time_start2)
{
time_end2 = time_start2;
//time_end2 不变
//time_end1变
}
else if (tsEnd >= time_start2 && tsEnd <= time_end2)
{
time_end2 = tsEnd;
//time_end 不变
//time_end2变
}
else if (tsEnd > time_end2)
{
//time_end 不变
//time_end2不变
}

return (time_end - time_start) + (time_end2 - time_start2);
}
}

三个时间段的 如工作时间为：//8:30-12:00 13.30-17.30 18.00-21.00

public class TimeHelper3
{

public static TimeSpan GetDateTimeSpan(DateTime dtStart, DateTime dtEnd, TimeSpan time_start, TimeSpan time_end, TimeSpan time_start2, TimeSpan time_end2, TimeSpan time_start3, TimeSpan time_end3)
{
if (dtStart.Date == dtEnd.Date) //如果是同一天
{
if (IsWorkDay(dtStart))
return GetTimeSpan(dtStart.TimeOfDay, dtEnd.TimeOfDay, time_start, time_end, time_start2, time_end2, time_start3, time_end3);
else
return new TimeSpan(0);
}
//如果不是同一天 计算天数减去1 乘以标准时长 加上分别计算开始开数和结束天数
double days = dtEnd.Date.Subtract(dtStart.Date).TotalDays - 1;

TimeSpan startTimeSpan;
if (IsWorkDay(dtStart))
startTimeSpan = GetTimeSpan(dtStart.TimeOfDay, new TimeSpan(23, 59, 60), time_start, time_end, time_start2, time_end2, time_start3, time_end3);//开始天
else
startTimeSpan = new TimeSpan(0);

TimeSpan endTimeSpan;
if (IsWorkDay(dtEnd))
endTimeSpan = GetTimeSpan(new TimeSpan(0, 0, 0), dtEnd.TimeOfDay, time_start, time_end, time_start2, time_end2, time_start3, time_end3);//结束天
else
endTimeSpan = new TimeSpan(0);

TimeSpan totalTimeSpan = startTimeSpan + endTimeSpan; //总值

TimeSpan preTimeSpan = GetTimeSpan(new TimeSpan(0, 0, 0), new TimeSpan(23, 59, 60), time_start, time_end, time_start2, time_end2, time_start3, time_end3);//开始天
for (int i = 1; i <= days; i++)
{
if (IsWorkDay(dtStart.AddDays(i)))
totalTimeSpan += preTimeSpan; //添加间隔天
}

return totalTimeSpan;
}

/// <summary>
/// 判断是否为工作日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static bool IsWorkDay(DateTime dt)
{
//先从日期表中，查找不是上班时间，如果不是直接返回 false ，如果是，直接返回 true。
//如果在日期表中，找不到，则查找定义的日历，依据日历定义的周末时间来定义是否为工作日。
//获取日历中不上班的标准周末时间,判断是不是上班时间
if (dt.DayOfWeek == DayOfWeek.Sunday || dt.DayOfWeek == DayOfWeek.Saturday)
return false;
else
return true;
}
//同一天获取
public static TimeSpan GetTimeSpan(TimeSpan tsStart, TimeSpan tsEnd, TimeSpan time_start, TimeSpan time_end, TimeSpan time_start2, TimeSpan time_end2, TimeSpan time_start3, TimeSpan time_end3)
{
//判断 开始时间
if (tsStart < time_start)
{
//标准开始时间不变
//start1 不变
//start2 不变
//start3 不变
}
else if (tsStart >= time_start && tsStart <= time_end)
{
//标准开始= dtStart
time_start = tsStart;
//start1 变
//start2 不变
//start3 不变
}
else if (tsStart > time_end && tsStart < time_start2)
{
time_start = time_end;
//start1 变
//start2 不变
//start3 不变
}
else if (tsStart >= time_start2 && tsStart <= time_end2)
{
time_start = time_end;
time_start2 = tsStart;
//start1 变
//start2 变
//start3 不变
}
else if (tsStart > time_end2 && tsStart < time_start3)
{
time_start = time_end;
time_start2 = time_end2;
//start1 变
//start2 变
//start3 不变
}
else if (tsStart >= time_start3 && tsStart <= time_end3)
{
time_start = time_end;
time_start2 = time_end2;
time_start3 = tsStart;
//start1 变
//start2 变
//start3 变
}
else if (tsStart > time_end3)
{
time_start = time_end;
time_start2 = time_end2;
time_start3 = time_end3;
}

//判断 结束时间
if (tsEnd < time_start)
{
//标准开始时间不变
time_end = time_start;
time_end2 = time_start2;
time_end3 = time_start3;
//time_end 变
//time_end2变
//time_end3变
}
else if (tsEnd >= time_start && tsEnd <= time_end)
{
time_end = tsEnd;
time_end2 = time_start2;
time_end3 = time_start3;
//time_end 变
//time_end2变
//time_end3变
}
else if (tsEnd > time_end && tsEnd < time_start2)
{
time_end2 = time_start2;
time_end3 = time_start3;
//time_end1 不变
//time_end2变
//time_end3变
}
else if (tsEnd >= time_start2 && tsEnd <= time_end2)
{
time_end2 = tsEnd;
time_end3 = time_start3;
//time_end 不变
//time_end2变
//time_end3变
}
else if (tsEnd > time_end2 && tsEnd < time_start3)
{
time_end3 = time_start3;
//time_end 不变
//time_end2不变
//time_end3变
}
else if (tsEnd >= time_start3 && tsEnd <= time_end3)
{
time_end3 = tsEnd;
//time_end 不变
//time_end2不变
//time_end3变
}
else if (tsEnd > time_end3)
{
//time_end 不变
//time_end2不变
//time_end3不变
}

return (time_end - time_start) + (time_end2 - time_start2) + (time_end3 - time_start3);
}
}

使用方法：

static void Main(string[] args)
{
DateTime dt = Convert.ToDateTime("2014-04-17 08:00");
DateTime dt2 = Convert.ToDateTime("2014-04-21 08:00");

TimeSpan tsStar1 = new TimeSpan(8, 0, 0);
TimeSpan tsEnd1 = new TimeSpan(12, 0, 0);

TimeSpan tsStar2 = new TimeSpan(13, 0, 0);
TimeSpan tsEnd2 = new TimeSpan(17, 0, 0);

TimeSpan tsStar3 = new TimeSpan(18, 0, 0);
TimeSpan tsEnd3 = new TimeSpan(21, 0, 0);

//8:30-12:00 13.30-17.30 18.00-21.00

TimeSpan ts1 = TimeHelper.GetDateTimeSpan(dt, dt2, tsStar1, tsEnd1);

TimeSpan ts2 = TimeHelper2.GetDateTimeSpan(dt, dt2, tsStar1, tsEnd1, tsStar2, tsEnd2);

TimeSpan ts3 = TimeHelper3.GetDateTimeSpan(dt, dt2, tsStar1, tsEnd1, tsStar2, tsEnd2, tsStar3, tsEnd3);

Console.WriteLine("一阶段:{0}天 {1}小时，{2}分，{3}秒", ts1.Days, ts1.Hours, ts1.Minutes, ts1.Seconds);
Console.WriteLine("两阶段:{0}天 {1}小时，{2}分，{3}秒", ts2.Days, ts2.Hours, ts2.Minutes, ts2.Seconds);
Console.WriteLine("三阶段:{0}天 {1}小时，{2}分，{3}秒", ts3.Days, ts3.Hours, ts3.Minutes, ts3.Seconds);

Console.ReadLine();

}