Visa Rules.

on my Chinese Visa it states (Enter Before) and not Expiry Date, reading this to me this entitles me to enter 1 day before that date and still stay the Maximum number of days in China before I require to exit or apply for a temporary residence visa, am I right in thinking this as there is no mention on the it of a Expiry date?? I do not want to come unstuck in China on the day the Expires(enter before) and in essence should be at an Airport waiting to exit China.