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Ò»¡¢DateTime –> string
ʱ¼äÀàÐÍת»¯³É×Ö·û´®ÀàÐÍ£¬ÄÇÊÇÏ൱µÄ¼òµ¥£¬Ö±½Óµ÷ÓÃToString()·½·¨¼´¿É¡£È磺
DateTime dt = DateTime.Now;
string dtStr = dt.ToString();
 
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dt.ToString("yyyyÄêMMÔÂddÈÕ");        //2005Äê11ÔÂ5ÈÕ
dt.ToString("yyyy-MM-dd");                      //2005-11-5
string.Format("{0:d}",dt);                  //2005-11-5
string.Format("{0:D}",dt);                  //2005Äê11ÔÂ5ÈÕ
 
ʱ¼äÀàÐ͸ñʽ»¯£¨³É×Ö·ûÀàÐÍ£©¿ÉÒÔͨ¹ýÁ½ÖÖ·½Ê½£º1¡¢×Ô¶¨Òåʱ¼ä¸ñʽ¡£×Ô¼º¶¨Òåʱ¼äµÄ¹¹³ÉºÍ±íʾ£»2¡¢±ê׼ʱ¼ä¸ñʽ¡£Óɱê×¼¿âÌṩµÄÓÐÏ޵ıíʾ·½Ê½¡££¨ÏêϸµÄÇé²Î¿¼ÁÐ±í£©
 
¶þ¡¢string -> DateTime
string dtString = “2009-10-12 00:12:05”;
DateTime dt = DateTime.Parse(dtStr);                      //·½Ê½Ò»
DateTime dt2 = Convert.ToDateTime(dtStr);              //·½Ê½¶þ
 
µ±È»DateTimeÒ²ÓжàÖÖ±íʾ·½Ê½£¨·Ç¸ñʽ»¯³É×Ö·û´®ÀàÐÍ£©£¬È磺
dt.ToFileTimeUtc();                  //127756704859912816
dt.ToLocalTime();                    //2005-11-5 21:21:25
dt.ToLongDateString();            //2005Äê11ÔÂ5ÈÕ
 
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dt.Year //2005
dt.Date


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