'2 year -2 month 21 day' why I get minus , when returning month - DATEDIFF

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When i executed my Query , i got a minus with month ! Can someone please point me in the right direction. Thanks.

SELECT 
CAST(DATEDIFF(yy, WorkStartDate, GETDATE()) AS varchar(4)) +' year '+
CAST(DATEDIFF(mm, DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate), GETDATE()) AS varchar(2)) +' month '+
CAST(DATEDIFF(dd, DATEADD(mm, DATEDIFF(mm, DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate), GETDATE()), DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate)), GETDATE()) AS varchar(2)) +' day'   as result
FROM dbo.Paychecks INNER JOIN dbo.Users ON Users.Id=Paychecks.UserId
WHERE Users.CustomerId=214 order by Users.FirstName;

What I have tried:

SELECT 
CAST(DATEDIFF(yy, WorkStartDate, GETDATE()) AS varchar(4)) +' year '+
CAST(DATEDIFF(mm, DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate), GETDATE()) AS varchar(2)) +' month '+
CAST(DATEDIFF(dd, DATEADD(mm, DATEDIFF(mm, DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate), GETDATE()), DATEADD(yy, DATEDIFF(yy, WorkStartDate, GETDATE()), WorkStartDate)), GETDATE()) AS varchar(2)) +' day'   as result
FROM dbo.Paychecks INNER JOIN dbo.Users ON Users.Id=Paychecks.UserId
WHERE Users.CustomerId=214 order by Users.FirstName;

Posted 22-Feb-17 23:09pm

Man Down

Updated 22-Feb-17 23:33pm

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Graeme_Grant · Accepted Answer · 2017-02-22T23:33:00

Solution 1

If the date on the left of the subtraction is less than the date on the right, then the result will be negative. Older dates are less in value to newer dates.

Posted 22-Feb-17 23:33pm

Graeme_Grant

Comments

Man Down 23-Feb-17 6:08am

tnx for your comment , i find out wat was problem

Maciej Los 23-Feb-17 10:57am

Short and to the point.
5!

Graeme_Grant 23-Feb-17 11:00am

thanks :)