The document discusses how to check the expiry date of LPG cylinders, which is important as expired cylinders can be dangerous and cause accidents. The expiry date is printed on the cylinder as a letter code representing the quarter (A,B,C,D) followed by two digits for the year, such as D06 meaning December 2006. The document urges sharing this information widely to increase public safety awareness about checking and returning expired LPG cylinders.