Date range is displayed incorrectly when start and end dates are on same day of the month

I have an event which begins on April 9th, and ends on May 9th. I output the date in my theme using this code:

``` php
eo_format_event_occurrence( FALSE, FALSE, 'l, F j, Y', '', '&ndash;', FALSE );
```

The date is displayed like this:

**Saturday, April–Monday, May 9, 2016**

It should be:

**Saturday, April 9–Monday, May 9, 2016**

The day in the start date is missing.
