给定一个日期,算出上周五日期时间:2022-12-01 19:06:48给定一个日期,算出上周五日期 DateTime dt=new DateTime(); for(double loop=0;loop<7;loop++) { dt=DateTime.Now.AddDays(-loop); if(dt.DayOfWeek==DayOfWeek.Friday) { break; } }