DateTime.Now.ToString() 用法
//2008年4月24日
System.DateTime.Now.ToString("D");
//2008-4-24
System.DateTime.Now.ToString("d");
//2008年4月24日 16:30:15
System.DateTime.Now.ToString("F");
//2008年4月24日 16:30
System.DateTime.Now.ToString("f");
//2008-4-24 16:30:15
System.DateTime.Now.ToString("G");
//2008-4-24 16:30
System.DateTime.Now.ToString("g");
//16:30:15
System.DateTime.Now.ToString("T");
//16:30 System.DateTime.Now.ToString("t");
//2008年4月24日 8:30:15
System.DateTime.Now.ToString("U");
//2008-04-24 16:30:15Z
System.DateTime.Now.ToString("u");
//4月24日
System.DateTime.Now.ToString("m");
System.DateTime.Now.ToString("M");
//Tue, 24 Apr 2008 16:30:15 GMT
System.DateTime.Now.ToString("r");
System.DateTime.Now.ToString("R");
//2008年4月
System.DateTime.Now.ToString("y");
System.DateTime.Now.ToString("Y");
//2008-04-24T15:52:19.1562500+08:00
System.DateTime.Now.ToString("o");
System.DateTime.Now.ToString("O");
//2008-04-24T16:30:15
System.DateTime.Now.ToString("s");
//2008-04-24 15:52:19
System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff");
//2008年04月24 15时56分48秒
System.DateTime.Now.ToString("yyyy年MM月dd HH时mm分ss秒");
//星期二, 四月 24 2008
System.DateTime.Now.ToString("dddd, MMMM dd yyyy");
//二, 四月 24 ’08
System.DateTime.Now.ToString("ddd, MMM d "’"yy");
//星期二, 四月 24
System.DateTime.Now.ToString("dddd, MMMM dd");
//4-08 System.DateTime.Now.ToString("M/yy");
//24-04-08 System.DateTime.Now.ToString("dd-MM-yy"); /
/字符型转换转为字符串 12345.ToString("n");
//生成 12,345.00 12345.ToString("C");
//生成 ¥12,345.00 12345.ToString("e");
//生成 1.234500e+004 12345.ToString("f4");
//生成 12345.0000 12345.ToString("x");
//生成 3039 (16进制) 12345.ToString("p");
//生成 1,234,500 //本年度销售额、本季度利润、本月新增客户
//今天 DateTime.Now.Date.ToShortDateString();
//昨天,就是今天的日期减一 DateTime.Now.AddDays(-1).ToShortDateString();
//明天,同理,加一 DateTime.Now.AddDays(1).ToShortDateString();
//本周(要知道本周的第一天就得先知道今天是星期几,从而得知本周的第一天就是几天前的那一天,要注意的是这里的每一周是从周日始至周六止 DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString();
DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString();
//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 = new string[]{ "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)];
//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(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString();
DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString();
//下周 DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString();
DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString();
//本月,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.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).ToShortDateString();//最后一天
//巧用C#里ToString的字符格式化更简便 DateTime.Now.ToString("yyyy-MM-01");
DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(1).AddDays(-1).ToShortDateString();
//上个月,减去一个月份 DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(-1).ToShortDateString();
DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString();
//下个月,加去一个月份 DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(1).ToShortDateString();
DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(2).AddDays(-1).ToShortDateString();
//7天后 DateTime.Now.Date.ToShortDateString(); DateTime.Now.AddDays(7).ToShortDateString();
//7天前 DateTime.Now.AddDays(-7).ToShortDateString(); DateTime.Now.Date.ToShortDateString();
//本年度,用ToString的字符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.ToString("yyyy-01-01")).ToShortDateString();
DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(1).AddDays(-1).ToShortDateString();
//上年度,不用再解释了吧 DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(-1).ToShortDateString();
DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddDays(-1).ToShortDateString();
//下年度 DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(1).ToShortDateString();
DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(2).AddDays(-1).ToShortDateString();
//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.AddMonths(0 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01");
//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.AddMonths(22 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString();
//下季度,相信你们都知道了。。。。收工 DateTime.Now.AddMonths(22 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01");
DateTime.Parse(DateTime.Now.AddMonths(6 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString();
//上季度 DateTime.Now.AddMonths(-22 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01");
DateTime.Parse(DateTime.Now.AddMonths(0 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString();
//2007年4月24日 this .TextBox1.Text = System.DateTime.Now.ToString( "D" ); //2007/4/24 this .TextBox2.Text = System.DateTime.Now.ToString( "d" ); //2007年4月24日 16:30:15 this .TextBox3.Text = System.DateTime.Now.ToString( "F" ); //2007年4月24日 16:30 this .TextBox4.Text = System.DateTime.Now.ToString( "f" ); //2007/4/24 16:30:15 this .TextBox5.Text = System.DateTime.Now.ToString( "G" ); //2007/4/24 16:30 this .TextBox6.Text = System.DateTime.Now.ToString( "g" ); //16:30:15 this .TextBox7.Text = System.DateTime.Now.ToString( "T" ); //16:30 this .TextBox8.Text = System.DateTime.Now.ToString( "t" ); //2007年4月24日 8:30:15 this .TextBox9.Text = System.DateTime.Now.ToString( "U" ); //2007-04-24 16:30:15Z this .TextBox10.Text = System.DateTime.Now.ToString( "u" ); //4月24日 this .TextBox11.Text = System.DateTime.Now.ToString( "m" ); this .TextBox12.Text = System.DateTime.Now.ToString( "M" ); //Tue, 24 Apr 2007 16:30:15 GMT this .TextBox13.Text = System.DateTime.Now.ToString( "r" ); this .TextBox14.Text = System.DateTime.Now.ToString( "R" ); //2007年4月 this .TextBox15.Text = System.DateTime.Now.ToString( "y" ); this .TextBox16.Text = System.DateTime.Now.ToString( "Y" ); //2007-04-24T15:52:19.1562500+08:00 this .TextBox17.Text = System.DateTime.Now.ToString( "o" ); this .TextBox18.Text = System.DateTime.Now.ToString( "O" ); //2007-04-24T16:30:15 this .TextBox19.Text = System.DateTime.Now.ToString( "s" ); //2007-04-24 15:52:19:9889 this .TextBox20.Text = System.DateTime.Now.ToString( "yyyy-MM-dd HH:mm:ss:ffff" ); //2007年04月24 15时56分48秒 this .TextBox21.Text = System.DateTime.Now.ToString( "yyyy年MM月dd HH时mm分ss秒" ); //星期二, 四月 24 2007 this .TextBox22.Text = System.DateTime.Now.ToString( "dddd, MMMM dd yyyy" ); //周三, 十二月 7 '11 this .TextBox23.Text = System.DateTime.Now.ToString( "ddd, MMM d "'"yy" ); //星期二, 四月 24 this .TextBox24.Text = System.DateTime.Now.ToString( "dddd, MMMM dd" ); //4/07 this .TextBox25.Text = System.DateTime.Now.ToString( "M/yy" ); //07-12-11 this .TextBox26.Text = System.DateTime.Now.ToString( "dd-MM-yy" ); string [] Day = new string [] { "星期日" , "星期一" , "星期二" , "星期三" , "星期四" , "星期五" , "星期六" }; //2011/12/6 昨天 this .TextBox1.Text = System.DateTime.Now.AddDays(-1).ToShortDateString(); //2011/12/8 明天 this .TextBox2.Text = DateTime.Now.AddDays(1).ToShortDateString(); //2011/12/4 本周星期天 this .TextBox3.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString(); //2011/12/10 本周星期六 this .TextBox4.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString(); //星期三 今天周几 this .TextBox5.Text = Day[Convert.ToInt16(DateTime.Now.DayOfWeek)]; //2011/11/27 上周日 this .TextBox6.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString(); //2011/12/3 上周六 this .TextBox7.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString(); //2011/12/11 下周日 this .TextBox8.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString(); //2011/12/17 下周六 this .TextBox9.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString(); //2011-12-01 本月一号 this .TextBox10.Text =DateTime.Now.ToString( "yyyy-MM-01" ); //2011/12/31 本月最后一天 this .TextBox11.Text=DateTime.Parse(DateTime.Now.ToString( "yyyy-MM-01" )).AddMonths(1).AddDays(-1).ToShortDateString(); //2011/11/1 上个月一号 this .TextBox12.Text=System.DateTime.Parse(DateTime.Now.ToString( "yyyy-MM-01" )).AddMonths(-1).ToShortDateString(); //2012/1/1 下个月一号 this .TextBox13.Text=System.DateTime.Parse(DateTime.Now.ToString( "yyyy-MM-01" )).AddMonths(1).ToShortDateSring(); |