Date Formatting in Blade Templates

The following is throwing a parse error in my subscription.blade.php file:

@if ($user->subscription_ends_at)
<td>{{ $user->subscription_ends_at->toDayDateTimeString() }}</td>
@endif 

I have added the subscription_end_at column to the $dates property so I am getting a Carbon instance, but for some reason Blade doesn't seem to like this. Or more likely I'm doing something incorrectly.

My error looks like this:

FatalErrorException in fcd769bf0e6c07b882c608eb7d899b17 line 79: syntax error, unexpected '}'

Thanks.