C# 根据日期判断星期几
https://blog.csdn.net/qq_43137834/article/details/104070561
var week_day = CultureInfo.CurrentCulture.DateTimeFormat.GetDayName(Date.DayOfWeek);
https://blog.csdn.net/qq_43137834/article/details/104070561
var week_day = CultureInfo.CurrentCulture.DateTimeFormat.GetDayName(Date.DayOfWeek);