Month exposed filter show month + hour

I have default contextual filter for date which allow me to go to the next/previous month.
I want also expose the filter with a select for the user can quickly go to the month he want.
I add in criteria a month date and check expose the filter to the user. I want a select option with the month, so I choose granularity month but it appear on the front there is a select with month choice but also hour select witch I don't need .