SQL Server common time-processing functions

1. Get the current time

SELECT GetDate ();

2. Get time in separate years, months, days and hours, minutes, seconds

Year (GetDate ()) part of the current time

Month (GetDate ()) monthly part of the current time

Day part of the current time (GetDate ())

The above function, in turn, returns the value of type int, which returns nvarchar

Datename (year, GetDate ())

Datename (MONTH, GetDate ())

Datename (Day, GetDate ())

3. Calculate a time interval of two date types

DATEDIFF (year, ' 2013-01-01 ', ' 2014-01-01 ') returns 1

DATEDIFF (MONTH, ' 2013-01-01 ', ' 2014-01-01 ') returns 12

DATEDIFF (Day, ' 2013-01-01 ', ' 2014-01-01 ') returns 365

4. Time plus minus

DATEADD (Day, GETDATE ()) 15 days ago

DATEADD ( -15, Day, GETDATE ()) 15 days later

5. Time interception

CONVERT (varchar), GETDATE (), 1) return 05/16/06

The significance of the specific elaboration is here: http://msdn.microsoft.com/zh-cn/library/ms187928%28v=sql.100%29.aspx

6. Determine the day of the week

Select DATEPART (dw,getdate ())-1

7. Judge the first quarter of the day

(MONTH (GetDate ())-1)/4 +1

SQL Server common time-processing functions