Difference of two date time in sql server

Question

Is there any way to take the difference between two datetime in sql server?

For example, my dates are

1. 2010-01-22 15:29:55.090

Answer 1

SELECT  DATEDIFF(day, '2010-01-22 15:29:55.090', '2010-01-22 15:30:09.153')

Replace day with other units you want to get the difference in, like second, minute etc.