在SQL Server中设置日期

关键是使用DATEADD和DATEDIFF以及适当的SQL时间跨度枚举。

declare @datetime datetime;
set @datetime = getdate();
select @datetime;
select dateadd(year,datediff(year,0,@datetime),0);
select dateadd(month,datediff(month,0,@datetime),0);
select dateadd(day,datediff(day,0,@datetime),0);
select dateadd(hour,datediff(hour,0,@datetime),0);
select dateadd(minute,datediff(minute,0,@datetime),0);
select dateadd(second,datediff(second,'2000-01-01',@datetime),'2000-01-01');
select dateadd(week,datediff(week,0,@datetime),-1); --Beginning of week is Sunday
select dateadd(week,datediff(week,0,@datetime),0); --Beginning of week is Monday

请注意，当您使用秒数进行底数转换时，如果使用0，通常会出现算术溢出。因此，请选择一个已知值，该值一定要小于您要底线的日期时间。