3 ms·

But if the user is over 18 then you need only the year without month and day.

• irishcoffee 8y ago
  If the user is 17.8 years old you need the month. If the user is 17.95 years old, you need the day.
  • Sephr 8y ago
    You don't need anything, just the user's affirmative confirmation in response to the prompt, "Are you 18 or older?"
    • zuppy 8y ago
      and what happens after 6 months, or a year? you keep nagging the user if it's 18 or not?
      • Sephr 8y ago
        People don't age backwards, so the question doesn't need to be asked again.