how can I find out the exact time my credit card was processed at a supermarket? My bank statement only tells me the day not the time
Look at the receipt from the supermarket. Assuming you kept it, of course.
Here's a few ways I would do it:
- Call the card provider and ask for that information.
- (Going forward) Setup text or other (email, facebook) alerting for every transaction that crosses a threshold. That way you could narrow down the transaction to within 5 min of the actual swipe.