How do I find out when my PPE was manufactured?
1. Serial number: starts with the year and month of manufacture. The month is indicated by a letter (A: January, B: February,... J: October, K: November, L: December) and it corresponds to the date on which production started for the product batch.
2. Manufacture date: this is easily found beside the MM/YY (month/year) factory icon and corresponds to the date on which manufacturing of the product was completed. 
 
A single batch of products can be manufactured over several days, potentially beginning at the end of one month and ending early the next one. So there may be a one-month difference between the two markings. In this case, you can use the more recent date for your PPE inspection.
Metal products have an unlimited lifespan. Products containing textiles and/or plastic have a lifespan of 10 years.
Other questions :
- How can I find the product sheet on the environmental qualities and characteristics of your product?
 - How do I contact Petzl?
 - How do I buy a Petzl product?
 - How do I retire my gear?
 - How do I find Petzl retailers around the world?
 - Before sending a defective product to Petzl, is there a specific procedure with a file number and a return date?
 - What is Petzl's guarantee policy?
 - What is the lifetime of my Petzl equipment?
 - What is PPE?
 - How do I care appropriately for my Petzl equipment?
 - How should I store my equipment?
 - What does WLL mean?