I already had a look at your calendar plugin. I don’t see a way to hide the header with the month/year/weekday information.
Additionally, the calendar plugin doesn’t look at all like the calendar in the date picker:
Currently, my app can archive emails daily, weekly and monthly. Monthly archiving is done on the first. I want to offer more options. So something like the first screenshot I posted from Acronis with the looks of your date picker is what I want to do.