Hello.
1) Its possible to have such type of form customization in the paid versions of Booking Calendar.
I these versions of Booking Calendar please open the Booking > Settings > Fields page, then in the action toolbar, select “2 Columns form template” and click on “Reset” (or “Both”) button, to reset the exist booking form customization to the default one.
You will have this booking form customization:
<div style="float:left;margin-right:10px; " > [calendar] </div>
<div style="float:left;" >
<p>First Name (required):<br />[text* name] </p>
<p>Last Name (required):<br />[text* secondname] </p>
<p>Email (required):<br />[email* email] </p>
<p>Phone:<br />[text phone] </p>
<p>Adults: [select visitors class:span1 "1" "2" "3" "4"] Children: [select children class:span1 "0" "1" "2" "3"]</p>
</div>
<div style="clear:both">
<p>Details:<br /> [textarea details 100x5 class:span6]</p>
[captcha]
<p>[checkbox* term_and_condition use_label_element "I Accept term and conditions"]</p>
<hr/><p>[submit class:btn "Send"] </p>
</div>
Click on “Save changes” button and then test it.
You can test Booking Calendar live demos at this page http://wpbookingcalendar.com/demo/ to be sure in functionality and do not have misunderstanding.
2) Relative issue with days, please send the link to the page, where you are having this issue to retest it.
Kind Regards.