Timer won't advance & no heat

The timer mode in my dryer has stopped as well as it’s not heating anymore. This is a propane dryer. I’ve been told by neighbors to replace the timer as this may have caused the heating to stop. I’ve been thinking about buying a new dryer as I am not sure that is the problem and I don’t want to put a lot of money into an older dryer and not have it work. Can you give me any suggestions please?