c_獲取系統(tǒng)時(shí)間

1、C#獲取時(shí)間，日期C#里內(nèi)置的DateTime基本上都可以實(shí)現(xiàn)這些功能，巧用DateTime會(huì)使你處理這些事來(lái)變輕松多了今天DateTime.Now.Date.ToShtDateString()昨天，就是今天的日期減一DateTime.Now.AddDays(1).ToShtDateString()明天，同理，加一DateTime.Now.AddDays(1).ToShtDateString()本周(要知道本周的第一天就得先知道今天是星

2、期幾，從而得知本周的第一天就是幾天前的那一天，要注意的是這里的每一周是從周日始至周六止DateTime.Now.AddDays(Convert.ToDouble((0Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShtDateString()DateTime.Now.AddDays(Convert.ToDouble((6Convert.ToInt16(DateTime.Now.DayOfWee

3、k)))).ToShtDateString()如果你還不明白，再看一下中文顯示星期幾的方法就應(yīng)該懂了由于DayOfWeek返回的是數(shù)字的星期幾，我們要把它轉(zhuǎn)換成漢字方便我們閱讀，有些人可能會(huì)用switch來(lái)一個(gè)一個(gè)地對(duì)照，其實(shí)不用那么麻煩的string[]Day=newstring[]“星期日““星期一““星期二““星期三““星期四““星期五““星期六“Day[Convert.ToInt16(DateTime.Now.DayOfWeek

4、)]上周，同理，一個(gè)周是7天，上周就是本周再減去7天，下周也是一樣DateTime.Now.AddDays(Convert.ToDouble((0Convert.ToInt16(DateTime.Now.DayOfWeek)))7).ToShtDateString()DateTime.Now.AddDays(Convert.ToDouble((6Convert.ToInt16(DateTime.Now.DayOfWeek)))7).To

5、ShtDateString()下周DateTime.Now.AddDays(Convert.ToDouble((0Convert.ToInt16(DateTime.Now.DayOfWeek)))7).ToShtDateString()DateTime.Now.AddDays(Convert.ToDouble((6Convert.ToInt16(DateTime.Now.DayOfWeek)))7).ToShtDateString()本

6、月很多人都會(huì)說(shuō)本月的第一天嘛肯定是1號(hào)，最后一天就是下個(gè)月一號(hào)再減一天。當(dāng)然這是對(duì)的一般的寫法DateTime.Now.Year.ToString()DateTime.Now.Month.ToString()“1“第一天DateTime.Parse(DateTime.Now.Year.ToString()DateTime.Now.Month.ToString()“1“).AddMonths(1).AddDays(1).ToShtDate

7、String()最后一天巧用C#里ToString的字符格式化更簡(jiǎn)便DateTime.Now.ToString(“yyyyMM01“)DateTime.Parse(DateTime.Now.ToString(“yyyyMM01“)).AddMonths(1).AddDays(1).ToShtDateString()上個(gè)月，減去一個(gè)月份DateTime.Parse(DateTime.Now.ToString(“yyyyMM01“)).Ad

8、dMonths(1).ToShtDateString()DateTime.Parse(DateTime.Now.ToString(“yyyyMM01“)).AddDays(1).ToShtDateString()下個(gè)月，加去一個(gè)月份DateTime.Parse(DateTime.Now.ToString(“yyyyMM01“)).AddMonths(1).ToShtDateString()DateTime.Parse(DateTime.

9、Now.ToString(“yyyyMM01“)).AddMonths(2).AddDays(1).ToShtDateString()7天后DateTime.Now.Date.ToShtDateString()DateTime.Now.AddDays(7).ToShtDateString()7天前DateTime.Now.AddDays(7).ToShtDateString()stringstrYM=currentTime.ToStri

10、ng(“y“)1.11取中文日期顯示_月日stringstrMD=currentTime.ToString(“m“)1.12取中文年月日stringstrYMD=currentTime.ToString(“D“)1.13取當(dāng)前時(shí)分，格式為：14：24stringstrT=currentTime.ToString(“t“)1.14取當(dāng)前時(shí)間，格式為：20030923T14:46:48stringstrT=currentTime.ToStr

11、ing(“s“)1.15取當(dāng)前時(shí)間，格式為：2003092314:48:30ZstringstrT=currentTime.ToString(“u“)1.16取當(dāng)前時(shí)間，格式為：2003092314:48stringstrT=currentTime.ToString(“g“)1.17取當(dāng)前時(shí)間，格式為：Tue23Sep200314:52:40GMTstringstrT=currentTime.ToString(“r“)1.18獲得當(dāng)前時(shí)

12、間n天后的日期時(shí)間DateTimenewDay=DateTime.Now.AddDays(100)stringstrT=DateTime.Now.ToString(“yyyyMMddHH:mm:ss“)System.DateTimecurrentTime=newSystem.DateTime()currentTime=System.DateTime.Now取當(dāng)前年月日時(shí)分秒stringY=currentTime.Year.ToStrin

13、g()取當(dāng)前年stringM=currentTime.Month.ToString()取當(dāng)前月stringD=currentTime.Day.ToString()取當(dāng)前日stringT=currentTime.Hour.ToString()取當(dāng)前時(shí)stringMM=currentTime.Minute.ToString()取當(dāng)前分stringS=currentTime.Second.ToString()取當(dāng)前秒stringSS=curr