获取一段时间的周数(过星期日算一周)
作者:互联网
计算一段时间的周数,将开始时间和结束时间作为参数传到一个封装的方法中即可计算。这里是通过判断开始时间的星期和结束时间的星期计算得出的结果。
public int GetWeekCount(DateTime startTime,DateTime endTime)
{
//获取开始时间的星期一
int startWeek = Convert.ToInt32(startTime.DayOfWeek);
//因为是以星期一为第一天,所以要判断weeknow等于0时,要向前推6天。
startWeek = (startWeek == 0 ? (7 - 1) : (startWeek - 1));
int daydiff = (-1) * startWeek;
string firstDay = startTime.AddDays(daydiff).ToString("yyyy-MM-dd");
DateTime startMonday = Convert.ToDateTime(firstDay);
//获取结束时间的星期日
int lastWeek = Convert.ToInt32(endTime.DayOfWeek);
int daydiff1 = 0;
if (lastWeek != 0)
{
daydiff1 = 7 - lastWeek;
}
//本周最后一天
string lastDay = endTime.AddDays(daydiff1).ToString("yyyy-MM-dd");
DateTime lastSunday = Convert.ToDateTime(lastDay);
TimeSpan timeSpan= (lastSunday - startMonday);
//返回总周数
return Convert.ToInt32(span1.Days + 1) / 7;
}
根据周次来反查出本周次的开始时间和结束时间
public (DateTime startDate, DateTime endDate) GetDateByZC(TimeFrame entity, int zc)
{
List<DateTime> list = new List<DateTime>();
for (DateTime d = entity.XQQZSJ.Value; d <= entity.XQJSSJ.Value; d = d.AddDays(1))
{
list.Add(d);
}
while (list.First().DayOfWeek != DayOfWeek.Monday)
{
list.Insert(0, list.First().AddDays(-1));
}
list = list.OrderByDescending(x => x).ToList();
while (list.First().DayOfWeek != DayOfWeek.Sunday)
{
list.Insert(0, list.First().AddDays(1));
}
list = list.OrderBy(x => x).ToList();
DateTime startDate = list[(zc - 1) * 7];
DateTime endDate = list[(zc - 1) * 7 + 6];
while (startDate < entity.XQQZSJ)
{
startDate = startDate.AddDays(1);
}
while (endDate > entity.XQJSSJ)
{
endDate = endDate.AddDays(-1);
}
endDate = DateTime.Parse(endDate.ToString("yyyy-MM-dd") + " 23:59:59");
return (startDate, endDate);
}
标签:星期日,startDate,endDate,int,周数,list,DateTime,获取,startWeek 来源: https://blog.csdn.net/weixin_43112239/article/details/89375316