I have a column of data as follows: 

```
 09/22/2015 10:25:22
 09/22/2015 10:27:00

```

I want to subtract `09/22/2015 10:27:00` from `09/22/2015 10:25:22` to get the value of `98` seconds. 

I tried formatting the cells to the form `mm/dd/yyyy hh:mm:ss` and then subtracting them, but it didn't work. 

Can I get the differences without removing the date and creating a separate column containing data in the format `hh:mm:ss` ?