C#今天时间的开始结束，今天是周几，本周的开始和结束

1. string nowTime = DateTime.Now.ToString(“yyyy-MM-dd HH:mm:ss”); // 当前时间
2. DateTime dtTodayZeroHour = Convert.ToDateTime(DateTime.Now.ToString(“yyyy-MM-dd 00:00:00”)); // 今天的00:00:00
3. DateTime dtTodayZeroHour = Convert.ToDateTime(DateTime.Now.ToString(“yyyy-MM-dd 23:59:59”)); // 今天的23:59:59
4. int currentDayOfWeek = Convert.ToInt32(dtTodayZeroHour.DayOfWeek.ToString(“d”)); // 今天是本周的周几
5. DateTime dtMonday = dtTodayZeroHour.AddDays(1 - (currentDayOfWeek == 0 ? 7 : currentDayOfWeek)); // 本周周一
6. DateTime dtFriday = dtMonday.AddDays(5);// 本周六