Hello, if it is a China Merchants Bank credit card, the number on the credit card should be the validity period of the credit card.

China Merchants Bank credit card is valid for 5 years and is displayed below the 16-digit credit card number. For example: If the number below the card number is 02/10-02/15, it means the card was issued in February 2010 and will expire at the end of February 2015; if the number below the card number is 02/13, it means the card will expire at the end of February 2015.