I'm looking for a valid webform date pattern, to validate a user's birthday (component date
).
I want to make sure the person is 18 years of age or older. However, Drupal requires the GNU Date Input Format.
This seems not to work - Drupal shows no error message at all ?
There is also a related answer Field Validation: 18 Years or Older, but this seems to be super complicated and does not affect the webform module.
18 years ago
? Using date arithmetic might well be unsuppoted, as it's not really a date format, it's date calculation.