C # Date function use Daquan

1 DateTime dt = DateTime.Now; 2 3 dt. ToString ();//2005-11-5 13:21:25 4 5 dt. Tofiletime (). ToString ();//127756416859912816 6 7 dt. TOFILETIMEUTC (). ToString ();//127756704859912816 8 9 dt. ToLocalTime (). ToString ();//2005-11-5 21:21:25 dt. Tolongdatestring (). ToString ();//November 5, 2005 dt. Tolongtimestring (). ToString ();//13:21:25 dt. ToOADate (). ToString ();//38661.5565508218. Dt. ToShortDateString (). ToString ();//2005-11-5 dt. Toshorttimestring (). ToString ();//13:21 dt. ToUniversalTime (). ToString ();//2005-11-5 5:21:25 dt. Year.tostring ();//2005 dt. Date.tostring ();//2005-11-5 0:00:00 dt. Dayofweek.tostring ();//saturday dt. Dayofyear.tostring ();//309 dt. Hour.tostring ();//13 dt.Millisecond.ToString ();//441 + dt. Minute.tostring ();//30-Notoginseng dt. Month.tostring ();//11, dt. Second.tostring ();//28. Dt. Ticks.tostring ();//632667942284412864, dt. Timeofday.tostring ();//13:30:28.4412864. Dt. ToString ();//2005-11-5 13:47:04, dt. AddYears (1). ToString ();//2006-11-5 13:47:04-DT. AddDays (1.1). ToString ();//2005-11-6 16:11:04 dt. AddHours (1.1). ToString ();//2005-11-5 14:53:04, dt. Addmilliseconds (1.1). ToString ();//2005-11-5 13:47:04 dt. AddMonths (1). ToString ();//2005-12-5 13:47:04, dt. AddSeconds (1.1). ToString ();//2005-11-5 13:47:05, dt. AddMinutes (1.1). ToString ();//2005-11-5 13:48:10 dt. Addticks (1000). ToString ();//2005-11-5 13:47:04 dt.compareto (DT). ToString ();//0. Dt. ADD (?). ToString ();//The question mark is a period of time. Equals ("2005-11-6 16:11:04"). ToString ();//false, dt. Equals (DT). ToString ();//true dt. GetHashCode (). ToString ();//1474088234. Dt. GetType (). ToString ();//system.datetime, dt. GetTypeCode (). ToString ();//datetime, dt. Getdatetimeformats (' s ') [0]. ToString ();//2005-11-05t14:06:25. Getdatetimeformats (' t ') [0]. ToString ();//14:06. Getdatetimeformats (' y ') [0]. ToString ();//November 2005 84 85Dt. Getdatetimeformats (' D ') [0]. ToString ();//November 5, 2005, dt. Getdatetimeformats (' D ') [1]. ToString ();//2005. Dt. Getdatetimeformats (' D ') [2]. ToString ()///week 62,005, dt. Getdatetimeformats (' D ') [3]. ToString ();//Saturday November 5, 2005. Getdatetimeformats (' M ') [0]. ToString ();//November 5 94 dt. Getdatetimeformats (' f ') [0]. ToString ();//November 5, 2005 14:06, dt. Getdatetimeformats (' g ') [0]. ToString ();//2005-11-5 14:06 98. Dt. Getdatetimeformats (' R ') [0]. ToString ();//sat, 2005 14:06:25 GMT100 101 string. Format ("{0:d}", DT);//2005-11-5102 103 string. Format ("{0:d}", dt);//November 5, 2005 104 string. Format ("{0:f}", dt);//November 5, 2005 14:23106 107 string. Format ("{0:f}", dt);//November 5, 2005 14:23:23108 109 string. Format ("{0:g}", DT);//2005-11-5 14:23110 111 string. Format ("{0:g}", DT);//2005-11-5 14:23:23112 113 String. Format ("{0:m}", dt);//November 5. Format ("{0:r}", DT);//sat, 2005 14:23:23 GMT116 117 string. Format ("{0:s}", DT);//2005-11-05t14:23:23118 119 string. Format ("{0:t} ", DT);//14:23120 121 string. Format ("{0:t}", DT);//14:23:23122 123 string. Format ("{0:u}", DT);//2005-11-05 14:23:23z124 string. Format ("{0:u}", dt);//November 5, 2005 6:23:23126 127 string. Format ("{0:y}", dt);//November 2005 129 string. Format ("{0}", dt);//2005-11-5 14:23:23 131 string. Format ("{0:yyyymmddhhmmssffff}", DT); 132 133 134 135 Calculates the difference in days between 2 dates 136 137--------------------------------------------    ---138 139 DateTime dt1 = Convert.datetime ("2007-8-1");   141 DateTime DT2 = Convert.datetime ("2007-8-15"); 142 143 TimeSpan span = DT2.              Subtract (DT1); 144 145 int Daydiff = span.                    Days + 1; 146 147 calculates the number of days in a certain year 148 149-----------------------------------------------151 int day = Datetime.daysinmonth (2007,       8);                                      153 days = 31; 154 155 Add day to date, reduce day 156 157-----------------------------------------------158 159 DateTime DT =datetime.now;160 161 dt. AddDays (1); Add one day 162 163 dt. AddDays (-1);//Reduce Day 164 165 Other years method similar to 166 167 Oracle SQL convert Date function 168 169-----------------------------------------------171 to_date ("2007-6-6", ' Yyyy-mm-dd ' ); 172 173 to_date ("2007/6/6", "Yyyy/mm/dd"); 174 175 176 177 The following set of data, how to find the table contains September records: 178 179 cggc_stratdate cggc_enddate180 181 =========================================182 183 2007-8-4 2007-9-5184 185 2007-9-5 2007-9-20186 187 2007-9-22 2007-  10-5188 189 SELECT * from TABLE190 191 (to_date (' 2007/9/1 ', ' yyyy/mm/dd ') between cggc_stratdate192 193 and Cggc_enddate OR Cggc_stratdate >=to_date (' 2007/9/1 ', ' yyyy/mm/dd ') 194 195 and Cggc_enddate<=to_date (' 2007/9/30 ', ' yyyy/mm/dd ') "196 197 OR to_date (' 2007/9/30 ', ' yyyy/mm/dd ') between cggc_stratdate198 199 and Cggc_enddate) ORDER by Cggc_stratdate ASC

C # Date function use Daquan