Illinois is in the Central Time Zone in the United States of America (USA). US Central Standard Time (CST) is 6 hours behind Greenwich Mean Time (GMT-6).
Credit Card Account Number Verification - Card Type Identification. This page provides information about identifying a credit card type from a card number's numeric range and number of digits. First digit must be a 3 and second digit must be a 4 or 7. Valid length: 15 digits. First digit must be 3 and second digit must be 0, 6, or 8. Valid length: 14 digits. Valid length: 16 digits.
How to validate credit card number? I found that credit card number is not just a sequence of number, but there's a rule for it. By understanding this rule we will know how to validate credit card number properly, especially if we develop system that needs it. Here are some information for doing credit card number validation: 1.