If they have a computer system, they sure can and will know everything about your employment time with them
Can Tim Hortons know weather you have worked there before or not?
It's whether and yes... I never correct spelling or grammar on here or try to come close to being correct myself :p BUT !! When you're seeking employment you kinda need to get your "shizit " together. I know this because it's my day job to. Also I know you're from Canada cos ' Tims :p