I'm trying to find the most simple way to subtract to DATETIMEs from each other to produce a difference in the format of YY:MM.

Concatenating DATEDIFF of the two periods by year and month clearly just combines the same time differences together so a time period that is 2 years apart shows 2yrs,24months, when I am hoping to get it to show 2yrs,0months.

```
DATEDIFF(y,startdate,GETDATE())

```

Any tips? Thanks! Using SQL Server.