I am trying to get "ago" time within C# but am currently struggling as I get this Error.

Basically this is what I am trying.

```
var dateAgo = $"{DateTime.Now.Subtract(booking.CreatedAt.Date)}";

```

`booking.createdAt.Date` is where my date for my booking is saved.
I can show `@dateAgo` in my HTML but the problem is when I try something like

```
@DateTime.Now.Date.Subtract(booking.CreatedAt.Date).ToString("d")

```

which sadly does not work.