Hi @Federico Coppola ,
Per my test, there is no such function to compare date in Microsoft forms. As a workaround, You could use Power Automate to achieve this.
For the hours and minutes ,currently time is not available in the date picker. It will show only date. You'd better create new questions to insert hours and minutes.
You could vote it here: https://microsoftforms.uservoice.com/forums/386451-welcome-to-microsoft-forms-suggestion-box/suggestions/35243584-add-time-and-date-input-fields-that-are-not-just-t
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