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.
Here are what some of the numbers stand for: The first digit in your credit-card number signifies the system 1  : 3 - travel/entertainment cards (such as American Express and Diners Club).2  4 - Visa. 3  5 - MasterCard.4  6 - Discover Card.he first digit in your credit-card number signifies the system 1  : 3 - travel/entertainment cards (such as American Express and Diners Club). 2  4 - Visa. 3  5 - MasterCard. 4  6 - Discover Card.