C#根据当前时间获取本周本月本季度等时间段精

1、DateTime dt 二 DateTime. Now; 山刖 时间DateTime startWeek 二 dtAddDays(1-Conv ert.Tol nt32(dt. DayOfWeek. ToStri ng(d; /本周周一DateTime en dWeekstartWeek. AddDays (6;体周 周 口DateTime startMo nthdt. AddDays (1- dt. Day; 本月 月初DateTime en dMo nth 二 startMo nth. AddMo nths(l.AddDays(一1;本月月末/DateTime en dMo nth 二 s

2、tartMo nth. AddDays(dt .AddMo nths (1 一 dtDays 一1; 本月月末DateTime startQuarter 二 dtAddM on ths (0- (dton th -1 %3AddDays(1- dtDay; / 本季度初DateTime en dQuarterstartQuarter. AddMo nths (3. AddDays (T ;DateTime startYear 二new DateTime(dt.Year, 1,1; /本年年初DateTime en dYear 二new DateTime(dt.Year,12, 31;本年年末至

3、于昨天、明天、上周、上月、上季度、上年度等等，只要 AddDays （、AddMonths （、Add Years （这几种方法组合卜就以了。C#中datetime的使用如果你还不明白，再看一下中文显示星期几的方法就应该懂了由于DayOfWeek返回的是数字的星期几，我们要把它转换成汉字方便我们阅读，有些人可能会用switch来一个一个地对照，其实不用那么麻烦的string Day =newstring 星期日,星期一罗星期二罗星期三岁星期四，星期五岁星期六；stri ng week 二DayConvert Tolnt32(DateTime.Now. DayOfWeek ToString(d

4、ToString(:/上周，同理，一个周是7天，上周就是本周再减去7天，下周也是一样DateTime Now. AddDays(Co nvert Tol nt32 (1一Con vert Tol nt32(DateTime Now. DayOfWeek -7;/上周一DateTimeNow. AddDays(Co nv ettTol nt32 (1-Co nvert. Tol nt32 (DateTime. Now. DayOfWeek -7. AddDays (6; 上.周星日)下周DateTime Now AddDays(Convert Tolnt32 (1-Con vertTol nt3

5、2(DateTime.Now. DayOfWeek+7; /下周一DateTime Now. AddDays(Co nvert Tol nt32 (1一Convert. Tolnt32 (DateTime. Now. DayOfWeek +7. AddDays (6: / 卜周 环月，很多人都会说本月的第一天嘛肯定是1号，最后一天就是下个月一号再减一天。当然 这是对的 一般的写法DateTime.Now. YearToSt:ring( + DateTime.Now. MonthToSt:ring(/第一天DateTime P arse(DateTime.Now.YearToStri ng( +

6、DateTime. Now. Mo nthToStri ng(+1 . AddMonths (1. AddDays (T. ToShortDateString(;/最后一一*天 /巧用 C#里ToStri ng的字符格式化更简便DateTime Now. ToStri ng(yyyy-MM-01;DateTime Parse(DateTime. Now. ToStri ng(yyyy-MM-01 . AddMo nths (1. AddDays (-1. ToShortDateStri ng(; 上个月, 减去一个月份DateTime P arse(DateTime.Now. ToStri n

7、g(yyyy-MM一01AddMo nths(-1ToS hortDateStri ng(:DateTime Parse(DateTime.Now. ToStri ng(yyyy一MM一01AddDays(-1ToSho rtDateStri ng(:下个月，加去一个月份DateTime Parse(DateTime.Now. ToStri ng(yyyy一MM-01AddM on ths(1. ToSh ortDateStri ng(:DateTime P arse(DateTime.Now. ToStri ng(yyyy一MM-01AddMo nths(2AddD ays(-1.ToSho

8、rtDateStri ng(;/7天后DateTime Now. Date ToShortDateStri ng(;DateTime Now AddDays(7 ToShortDateStri ng（；7天前DateTime Now. AddDays(-7 ToShortDateStri ng(:DateTime. Now. Date. ToShortDateString (:9 用 ToString 的了付格式化!我们也很容易地算出本年度的第一天和最后一天DateTime Parse(DateTime.Now ToStri ng(yyyy一01一01 ToShortDateStri ng(;

9、DateTime Parse(DateTime .Now. ToStri ng (yyyy一01一01AddYears(1AddDay s (一1. ToShortDateStri ng(: /上年度，不用再解释了吧DateTime Parse(DateTime.Now. ToStri ng(yyyy一01一01AddYears(-1. ToShor tDateStri ng(;DateTime Parse(DateTime.Now.ToStri ng(yyyy一01一01 AddDays(一1ToShor tDateStri ng(:下年度DateTime P arse(DateTime .

10、Now .ToStri ng(yyyy一01一01AddYears(1. ToShortDateStri ng(:DateTime Parse(DateTime.Now. ToStri ng(yyyy一01一01AddYears(2AddDay s(-l.ToShetDateStri ng(; /本季度，很多人都会觉得这里难点，需要写个长长的过程来判 断。其实不用的，我们都知道一年四个季度，一个季度三个月首先我们先把日期推到本季度第一个月，然后这个月的第一天就是本季度的第一天了DateTime. Now. AddMo nths (0- (DateTime. Now. Mo nth -1 %3.

11、 AddDays(1-DateTime.Now.Day; ff同理，本季度的最后一天就是下季度的第一天减一DateTime Parse(DateTime. Now. AddMo nths (3- (DateTime. NowMo nth-1 %3. ToString (yyyy-MM-01 . AddDays (-1. ToShortDateString (: / 卜马相宿你们都知道了。收工DateTime Now. AddMo nths (3- (DateTime Now. Mo nth-1 %3. ToStri ng (yyyy-MM-01;DateTime Parse(DateTimeN

12、ow .AddMo nths (6- (DateTime .NowMo nth-1 %3. ToString (yyyy-MM-01 . AddDays (-1. ToShortDateString (: /DateTime. Now. AddMo nths (-3- (DateTime. Now. Mo nth -1 %3.AddDays(1- DateTime Now; DateTime Now. AddMo nths (0-(DateTime. Now. Mo nth -1 %3. AddDays(1-DateTime Now. Day. AddDays(一1. ToShortDateStri ng(;女口: 20100101转换成日期型？20100101 转换成 int 型怎么转换?？1、DateTimedt=Co nvert. ToDateTime (，20100101，/. Substri ng (0, 4+z，- +20100101 Substri ng (4, 2+，z- +20071107. Substri ng (6,2; inti=Co nvert.Tol nt32(20100101；2、Convert ToDateTime DateTime Parse(3、string str 二20100101; DateTime dt 二 DateTimePa