May 27, 2020

Overview of common DateTime methods in C

DateTime.Now.ToShortTimeString() DateTime dt = DateTime.Now; dt.ToString();//2005-11-5 13:21:25 dt.ToFileTime().ToString(); //127756416859912816 dt.ToFileTimeUtc().ToString();//127756704859912816 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 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 (); // question mark is 1 time period dt.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 dt.GetDateTimeFormats(‘t’)[0].ToString();//14:06 dt. GetDateTimeFormats (’ y) [0]. ToString (); / / in November 2005 dt. GetDateTimeFormats (’ D) [0]. ToString (); // November 5, 2005 dt.GetDateTimeFormats(‘D’)[1].ToString();//2005 11 05 dt. GetDateTimeFormats (’ D) [2]. ToString (); // Monday 6, 2005 11, 05 dt. GetDateTimeFormats (’ D) [3]. ToString (); // Monday 6 November 5, 2005 dt. GetDateTimeFormats (’ M) [0]. ToString (); / / on November 5 dt. GetDateTimeFormats (’ f) [0]. ToString (); // on November 5, 2005, 14:06 dt.GetDateTimeFormats(‘g’)[0].ToString();//2005-11-5 14:06 dt.GetDateTimeFormats(‘r’)[0].ToString();//Sat, 05 Nov 2005 14:06:25 GMT string.Format(“{0:d}“,dt);//2005-11-5 string. Format (” {0: D} ”, dt); // November 5, 2005 string. Format (” {0: f} ”, dt); // November 5, 2005 14:23 string. Format (” {0: F} ”, dt); // November 5, 2005 14:23:23 string.Format(“{0:g}“,dt);//2005-11-5 14:23 string.Format(“{0:G}“,dt);//2005-11-5 14:23:23 string. Format (” {0: M} ”, dt); / / on November 5 string.Format(“{0:R}“,dt);//Sat, 05 Nov 2005 14:23:23 GMT string.Format(“{0:s}“,dt);//2005-11-05T14:23:23 string.Format(“{0:t}“,dt);//14:23 string.Format(“{0:T}“,dt);//14:23:23 string.Format(“{0:u}“,dt);//2005-11-05 14:23:23Z string. Format (” {0: U} ”, dt); // November 5, 2005 6:23:23 string. Format (” {0: Y} ”, dt); / / in November 2005 string.Format(“{0}“,dt);//2005-11-5 14:23:23 string.Format(“{0:yyyyMMddHHmmssffff}“,dt); Calculate the number of days between the two dates ----------------------------------------------- DateTime dt1 = Convert.DateTime(“2007-8-1”); DateTime dt2 = Convert.DateTime(“2007-8-15”); TimeSpan span = dt2.Subtract(dt1); int dayDiff = span.Days + 1; Count the number of days in a year ----------------------------------------------- int days = DateTime.DaysInMonth(2007, 8); days = 31; Add one day to the date and subtract one day from it ----------------------------------------------- DateTime dt =DateTime.Now; dt. AddDays (1); // add one more day dt. AddDays (1); // one less day Other year methods are similar… Convert the date function in Oracle SQL ----------------------------------------------- to_date(“2007-6-6”,‘YYYY-MM-DD”); to_date(“2007/6/6”,‘yyyy/mm/dd”); The following is a set of data. How to find the records of September in the table: CGGC_STRATDATE CGGC_ENDDATE ========================================= 2007-8-4 2007-9-5 2007-9-5 2007-9-20 2007-9-22 2007-10-5 SELECT * FROM TABLE (TO_DATE(‘2007/9/1’,‘yyyy/mm/dd’) BETWEEN CGGC_STRATDATE AND CGGC_ENDDATE OR CGGC_STRATDATE > =TO_DATE(‘2007/9/1’,‘yyyy/mm/dd’) AND CGGC_ENDDATE < =TO_DATE(‘2007/9/30’,‘yyyy/mm/dd’) ” OR TO_DATE(‘2007/9/30’,‘yyyy/mm/dd’) BETWEEN CGGC_STRATDATE AND CGGC_ENDDATE) ORDER BY CGGC_STRATDATE ASC