Validating credit card numbers expiry dates Free dating sites for grandmas who want sex

To prevent this kind of error, implementations of the text box UI could disallow users from entering any digit other than 0 or 1 as the first digit in the month input box.Since any positive year is valid, the year input box need only disallow users from entering a minus to prevent year syntax errors.Is there actually a disadvantage of providing a default value that only suits a minority of users?Actually, there are two disadvantages, both of which stem from the need for users to change the default value to the correct value.Users can make syntactic and semantic errors when transcribing data from the credit card to the UI.Syntactic errors occur when users enter values that are not valid; semantic errors occur when users enter valid values that are not correct.

Since credit card entry form UIs generally ask for the credit card number before the expiry date, after entering the credit card number, users that see the default expiry date may assume that the UI has populated the expiry date based on the card number.Credit cards use a standard expiry date format of two month digits followed by two year digits (MM / YY).However, UIs for capturing expiry dates are far from standard.If we assume that credit cards have a maximum lifetime of five years, then the newest cards will expire in 2020.This gives a range of years from which to choose the default year: 2015, 2016, 2017, 2018, 2019 or 2020.

Search for validating credit card numbers expiry dates:

validating credit card numbers expiry dates-29validating credit card numbers expiry dates-50validating credit card numbers expiry dates-82validating credit card numbers expiry dates-77

Leave a Reply

Your email address will not be published. Required fields are marked *

One thought on “validating credit card numbers expiry dates”