DateTime dt1 = new DateTime(DateTime.Now.Year, 1, 1); DateTime dt2 = new DateTime(DateTime.Now.Year + 1, 1, 1); DateTime dt3 = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1); DateTime dt4 = new DateTime(DateTime.Now.Year, DateTime.Now.Month + 1, 1); MessageBox.Show("Days of Current Year is " + (dt2 - dt1).Days); MessageBox.Show("Days of Current Month is " + (dt4 - dt3).Days); MessageBox.Show("Week Day of Current Month 1st Day is " + dt3.DayOfWeek);
int y = DateTime.IsLeapYear(DateTime.Today.Year) ? 366 : 365; int m = DateTime.Today.AddMonths(1).AddDays(-1).Day; int d = (int)DateTime.Today.DayOfWeek;
DateTime dt = DateTime.Today; int y = DateTime.IsLeapYear(dt.Year) ? 366 : 365; int m = (new DateTime(dt.Year, dt.AddMonths(1).Month, 1)).AddDays(-1).Day; int d = (int)dt.DayOfWeek;
select * from jy_jjgl a ,jy_jygl b where convert(varchar(10),a.shtime,120)='2007-11-27' 1.显示本月第一天SELECT DATEADD(mm,DATEDIFF(mm,0,getdate()),0) select convert(datetime,convert(varchar(8),getdate(), 120)+'01',120) 2.显示本月最后一天select dateadd(day,-1,convert(datetime,convert (varchar(8),dateadd(month,1,getdate()),120)+'01',120)) SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate())+1,0)) 3.上个月的最后一天SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0)) 4.本月的第一个星期一iselect DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart( day,getdate()),getdate())),0) 5.本年的第一天SELECT DATEADD(yy,DATEDIFF(yy,0,getdate()),0) 6.本年的最后一天SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0)) 7.去年的最后一天SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate()),0)) 8.本季度的第一天SELECT DATEADD(qq,DATEDIFF(qq,0,getdate()),0) 9.本周的星期一SELECT DATEADD(wk,DATEDIFF(wk,0,getdate()),0) 10.查询本月的记录select * from tableName where DATEPART(mm, theDate) =DATEPART(mm, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE()) 11.查询本周的记录select * from tableName where DATEPART(wk, theDate) = DATEPART (wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE()) 12查询本季的记录 注:其中:GETDATE()是获得系统时间的函数。select * from tableName where DATEPART(qq, theDate) = DATEPART (qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE()) 13.获取当月总天数:select DATEDIFF(dd,getdate(),DATEADD (mm, 1, getdate()))select datediff(day, dateadd(mm, datediff(mm,'',getdate()), ''), dateadd(mm, datediff(mm,'',getdate()), '1900-02-01')) 14.获取当前为星期几DATENAME(weekday, getdate())
DateTime dt2 = new DateTime(DateTime.Now.Year + 1, 1, 1);
DateTime dt3 = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1);
DateTime dt4 = new DateTime(DateTime.Now.Year, DateTime.Now.Month + 1, 1); MessageBox.Show("Days of Current Year is " + (dt2 - dt1).Days);
MessageBox.Show("Days of Current Month is " + (dt4 - dt3).Days);
MessageBox.Show("Week Day of Current Month 1st Day is " + dt3.DayOfWeek);
int m = DateTime.Today.AddMonths(1).AddDays(-1).Day;
int d = (int)DateTime.Today.DayOfWeek;
int y = DateTime.IsLeapYear(dt.Year) ? 366 : 365;
int m = (new DateTime(dt.Year, dt.AddMonths(1).Month, 1)).AddDays(-1).Day;
int d = (int)dt.DayOfWeek;
1.显示本月第一天SELECT DATEADD(mm,DATEDIFF(mm,0,getdate()),0)
select convert(datetime,convert(varchar(8),getdate(),
120)+'01',120)
2.显示本月最后一天select dateadd(day,-1,convert(datetime,convert
(varchar(8),dateadd(month,1,getdate()),120)+'01',120))
SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate())+1,0))
3.上个月的最后一天SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0))
4.本月的第一个星期一iselect DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart(
day,getdate()),getdate())),0)
5.本年的第一天SELECT DATEADD(yy,DATEDIFF(yy,0,getdate()),0)
6.本年的最后一天SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0))
7.去年的最后一天SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate()),0))
8.本季度的第一天SELECT DATEADD(qq,DATEDIFF(qq,0,getdate()),0)
9.本周的星期一SELECT DATEADD(wk,DATEDIFF(wk,0,getdate()),0)
10.查询本月的记录select * from tableName where DATEPART(mm, theDate)
=DATEPART(mm, GETDATE()) and DATEPART(yy, theDate)
= DATEPART(yy, GETDATE())
11.查询本周的记录select * from tableName where DATEPART(wk, theDate) = DATEPART
(wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
12查询本季的记录 注:其中:GETDATE()是获得系统时间的函数。select * from tableName where DATEPART(qq, theDate) = DATEPART
(qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
13.获取当月总天数:select DATEDIFF(dd,getdate(),DATEADD
(mm, 1, getdate()))select datediff(day,
dateadd(mm, datediff(mm,'',getdate()), ''),
dateadd(mm, datediff(mm,'',getdate()), '1900-02-01'))
14.获取当前为星期几DATENAME(weekday, getdate())