//獲取日期+時間
DateTime.Now.ToString();            // 2008-9-4 20:02:10
DateTime.Now.ToLocalTime().ToString();        // 2008-9-4 20:12:12

//獲取日期
DateTime.Now.ToLongDateString().ToString();    // 2008年9月4日
DateTime.Now.ToShortDateString().ToString();    // 2008-9-4
DateTime.Now.ToString("yyyy-MM-dd");        // 2008-09-04
DateTime.Now.Date.ToString();            // 2008-9-4 0:00:00

//獲取時間
DateTime.Now.ToLongTimeString().ToString();   // 20:16:16
DateTime.Now.ToShortTimeString().ToString();   // 20:16
DateTime.Now.ToString("hh:mm:ss");        // 08:05:57
DateTime.Now.TimeOfDay.ToString();        // 20:33:50.7187500

//其他

DateTime.ToFileTime().ToString();       // 128650040212500000
DateTime.Now.ToFileTimeUtc().ToString();   // 128650040772968750
DateTime.Now.ToOADate().ToString();       // 39695.8461709606
DateTime.Now.ToUniversalTime().ToString();   // 2008-9-4 12:19:14

DateTime.Now.Year.ToString();          獲取年份   // 2008
DateTime.Now.Month.ToString();      獲取月份   // 9
DateTime.Now.DayOfWeek.ToString(); 獲取星期   // Thursday
DateTime.Now.DayOfYear.ToString(); 獲取第幾天   // 248
DateTime.Now.Hour.ToString();          獲取小時   // 20
DateTime.Now.Minute.ToString();     獲取分鐘   // 31
DateTime.Now.Second.ToString();     獲取秒數(shù)   // 45

//n為一個數(shù),可以數(shù)整數(shù),也可以事小數(shù)
dt.AddYears(n).ToString();   //時間加n年
dt.AddDays(n).ToString();   //加n天
dt.AddHours(n).ToString();   //加n小時
dt.AddMonths(n).ToString();   //加n個月
dt.AddSeconds(n).ToString();   //加n秒
dt.AddMinutes(n).ToString();   //加n分

------------------------------------------------------------------------------------------------------------------------

2008-09-19 12:36this.ltlDate.Text=DateTime.Now.Year.ToString()+"年"+DateTime.Now.Month.ToString()+"月"+DateTime.Now.Day.ToString()+"日     "+this.GetWeekDay();

private string GetWeekDay()
{
string Temp="";
switch (DateTime.Now.DayOfWeek)
{
case DayOfWeek.Sunday:
Temp = "星期天";
break;
case DayOfWeek.Monday:
Temp = "星期一";
break;
case DayOfWeek.Tuesday:
Temp = "星期二";
break;
case DayOfWeek.Wednesday:
Temp = "星期三";
break;
case DayOfWeek.Thursday:
Temp = "星期四";
break;
case DayOfWeek.Friday:
Temp = "星期五";
break;
case DayOfWeek.Saturday:
Temp = "星期六";
break;
}
return Temp;
}

其它：

1.綁定時格式化日期方法:
<ASP:BOUNDCOLUMN DATAFIELD= "JoinTime " DATAFORMATSTRING= "{0:yyyy-MM-dd} " >
<ITEMSTYLE WIDTH= "18% " > </ITEMSTYLE >
</ASP:BOUNDCOLUMN > 2.數(shù)據(jù)控件如DataGrid/DataList等的件格式化日期方法:
e.Item.Cell[0].Text = Convert.ToDateTime(e.Item.Cell[0].Text).ToShortDateString();
3.用String類轉(zhuǎn)換日期顯示格式:
String.Format( "yyyy-MM-dd ",yourDateTime);
4.用Convert方法轉(zhuǎn)換日期顯示格式:
Convert.ToDateTime("2005-8-23").ToString
("yyMMdd",System.Globalization.DateTimeFormatInfo.InvariantInfo); //支持繁體數(shù)據(jù)庫
5.直接用ToString方法轉(zhuǎn)換日期顯示格式:
DateTime.Now.ToString("yyyyMMddhhmmss");
DateTime.Now.ToString("yyyy/MM/dd hh:mm:ss")
6.只顯示年月
DataBinder.Eval(Container.DataItem,"starttime","{0:yyyy-M}")
7.顯示時間所有部分，包括：年月日時分秒
<asp:BoundColumn DataField="收款時間" HeaderText="收款時間"
DataFormatString="{0:yyyy-MM-dd HH24:mm:ss}">
</asp:BoundColumn>