To get the difference between two dates use the following query
For Days difference
- Select datediff(DAY,'2013-12-11 23:37:29.983',GETDATE())
For Month's difference
- Select datediff(MONTH,'2013-12-11 23:37:29.983',GETDATE())
For year difference
- Select datediff(YEAR,'2013-12-11 23:37:29.983',GETDATE())