SQL SERVER DATEDIFF FUNCTION

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WHY SELECT DATEDIFF(year,'2001-12-21 00:00:00.000' , '2015-12-17 00:00:00.000') in sql server is shows me 14 instead of 13

Posted 8-Dec-15 0:48am

Member 11463653

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_Asif_ · Answer 1 · 2015-12-08T01:05:00

Solution 1

You can find a very good discussion over datediff here![^] which should solve your problem

Posted 8-Dec-15 1:05am

_Asif_

Suvendu Shekhar Giri · Answer 2 · 2015-12-08T01:12:00

Solution 2

This is because DATEDIFF(YEAR,.. doesn't check units lower than year and just subtracts years i.e, 2015-2001 in your case.
You can check

SQL

SELECT DATEDIFF(year,'2001-12-21 00:00:00.000' , '2015-01-01 00:00:00.000')

and it will still return 14 as result.

Posted 8-Dec-15 1:12am

Suvendu Shekhar Giri

v2

Simon_Whale · Answer 3 · 2015-12-08T01:16:00

Solution 3

have a read of this DateDiff (Transact SQL)[^]

it states in there if the first date then changes year i.e. from 2001 to 2002 that will be counted in the year total. that is why you get 14 instead of the 13

Posted 8-Dec-15 1:16am

Simon_Whale

Comments

Member 11463653 8-Dec-15 7:24am

than why did they are taking date as a argument instead of year(int), if they are taking date as argument than they should calculate on date not just part of date.
please make me correct if I am wrong.

Simon_Whale 8-Dec-15 11:30am

becuase then you should of used YEAR(datecolumn) - YEAR(datecolumn)

https://msdn.microsoft.com/en-GB/library/ms186313.aspx?f=255&MSPPError=-2147217396