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DateTime.Now.ToShortTimeString()
DateTime dt = DateTime.Agora;
dt.ToString();//2005-11-5 13:21:25
//127756416859912816
//127756704859912816
//2005-11-5 21:21:25
dt.ToLongDateString().ToString();//2005, 11 de maio de 5
dt.ToLongTimeString().ToString();//13:21:25
//38661.5565508218
//2005-11-5
dt.ToShortTimeString().ToString();//13:21
//2005-11-5 5:21:25
dt.Ano.ToString();//2005
dt.Date.ToString();//2005-11-5 0:00:00
dt.DayOfWeek.ToString();//sábado
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
//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();//问号为一个时间段
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();//2005, 11 de janeiro
dt.GetDateTimeFormats('D')[0].ToString();//2005, 11 de janeiro, 5 de janeiro
dt.GetDateTimeFormats('D')[1].ToString();//2005 11 05
dt.GetDateTimeFormats('D')[2].ToString();//星期六 2005 11 05
dt.GetDateTimeFormats('D')[3].ToString();//Versão de 2005, 11 de maio de 5
dt.GetDateTimeFormats('M')[0].ToString();/11 de maio de 5
dt.GetDateTimeFormats('f')[0].ToString();//2005, 11 de janeiro, 14:06
dt.GetDateTimeFormats('g')[0].ToString();//2005-11-5 14:06
dt.GetDateTimeFormats('r')[0].ToString();//Sábado, 05 de novembro de 2005 14:06:25 GMT
string.Format("{0:d}",dt);//2005-11-5
string.Format("{0:D}",dt);//2005, 11 de janeiro, 5 de janeiro
string.Format("{0:f}",dt);//2005, 11 de maio, 14:23
string.Format("{0:F}",dt);//2005, 11 de maio, 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);//11 de maio de 5
string.Format("{0:R}",dt); //Sábado, 05 de novembro de 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);//2005, 11 de janeiro, 5:23:23
string.Format("{0:Y}",dt);//2005, 11º ano
string.Format("{0}",dt);//2005-11-5 14:23:23
string.Format("{0:yyyyMMddHHmmssffff}",dt);
计算2个日期之间的天数差
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DateTime dt1 = Convert.DateTime("2007-8-1");
DateTime dt2 = Convert.DateTime("15/08/2007");
Intervalo de intervalo de tempo = dt2.Subtract(dt1);
int dayDiff = span.Dias + 1;
计算某年某月的天数
-----------------------------------------------
int dias = DateTime.DaysInMonth(2007, 8);
dias = 31;
给日期增加一天、减少一天
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DateTime dt =DateTime.Agora;
dt.AddDays(1); //增加一天
dt.AddDays(-1);//减少一天 其它年份方法类似...
Atualização do Oracle SQL
-----------------------------------------------
to_date("2007-6-6",'AAAA-MM-DD");
to_date("2007/6/6",'aaaa/mm/dd");
如下一组数据,如何查找表里包含9月份的记录:
CGGC_STRATDATE CGGC_ENDDATE
========================================
4/8/2007
20/09/2007 20/09/2007
22/09/2007
SELECIONE * DA TABELA
(TO_DATE('2007/9/1','aaaa/mm/dd') ENTRE CGGC_STRATDATE
AND CGGC_ENDDATE OR CGGC_STRATDATE >=TO_DATE('2007/9/1','aaaa/mm/dd')
AND CGGC_ENDDATE<=TO_DATE('30/09/2007','aaaa/mm/dd') "
OU TO_DATE('30/09/2007','aaaa/mm/dd') ENTRE CGGC_STRATDATE
E CGGC_ENDDATE) PEDIDO POR CGGC_STRATDATE ASC
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