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.
Credit card numbers are not random. They can be checked by a mathematical formula for validity. Each kind of credit card uses a slightly different rule. For details, see the source code in FormChek.js. This sample form checks credit cards for validity, so you must enter a valid credit card number. Use one of the sample numbers from this list: