Generally speaking I am wondering about expiration dates given on products. For example I have a Bobbi Brown foundation with oxybenzone and titanium dioxide sunscreen. The little date symbol on the bottle (jar symbol with 24 inside) says it is ok for 24 months. I don't know whether to trust this or not. I have read in other places not to use a sunscreen older than 12 months. I hate to throw out a $40 bottle of foundation though that still is about half full. I also have some sunscreen from Clinique, also says it will last 24 monts on the tube. Both of these items are about 1 year old now. I keep using them but I am not sure if I should! Does anyone else know more about this or have any thoughts on it? Thanks in advance!