DateDiff of MS SQL system functions

Source: Internet
Author: User

DateDiff is commonly used to calculate date difference functions, using the following syntax:

DATEDIFF (DatePart, StartDate, EndDate)

Where parameter datepart has the following options (only common parameters are listed):

DatePart Abbreviation Explain
Year Yy,yyyy Years
Month Mm,m Month
Day Dd,d Days
Week Wk,w Week
Hour hh Hours
Minute Mi,n Minutes
Second Ss,s Seconds
Millisecond Ms Milliseconds

The following examples illustrate:

    • Calculate the number of years between two dates
SELECT DATEDIFF (year,'2014-01-01', GETDATE ()) as years

You can also use an abbreviated form

SELECT DATEDIFF (YY,'2014-01-01', GETDATE ()) as years

Or

SELECT DATEDIFF (YYYY,'2014-01-01', GETDATE ()) as years

return result 3

    • Calculate the number of months between two dates
SELECT DATEDIFF (MONTH,'2017-01-01', GETDATE ()) as MONTHS

Return result 5

Other types of usage are about the same, not much more.

DateDiff of MS SQL system functions

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