Date format and past date check function

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I'm looking to combine my logic into a single function to check if the user's input is in my required format and to make sure the date is not in the past. Every time I think about it, it seems like I'm just a step away or there is a very simple solution but I've been stewing over this all day without any success.

Here's what I have so far:

from datetime import datetime

user_date = input("Provide date: ")

valid = False

while not valid:
    try:
        date = datetime.strptime(
            user_date, "%m/%d/%Y").strftime("%m/%d/%Y")
        valid = True
    except ValueError:
        user_date = input("Incorrect date format. Please try again: ")

I also have this snippet but am at a lose for how to incorporate it:

past = datetime.strptime(user_date, "%m/%d/%Y")
present = datetime.now()

if past.date() < present.date():
    return True
else:
    return False

I was thinking I could just put the past date check after the valid format check however if it fails the second check, I need to go back and make sure that their new input is in the valid format again.

As a bonus, I'm taking the time in a different input so if someone can help me take it as one input, that'd be great too.