5 Answers
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Time goes slower for a fast moving reference frame relative to another frame. This can be noticed and detected. But time never goes backward relative to any frame.
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What we can barely see, is our getting older ….
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Time only goes faster or slower for us relative to the rest of the universe. That’s a very important aspect of this. We still experiece time at the same rate, it just may not be at the same rate as everywhere/everything else. But no, time cannot elapse backwards, that’s a very significant aspect of time.
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Time is a concept. The “rules” of time don’t allow it to go backwards.