Hmmm, if you’re asking if the external flow of what we perceive as time would shift according to an observer’s state of mind, that’s doubtful.

But our perception of time isn’t the same thing as the flow of time. Our temporal sense is definitely subjective, and there’s been some research into that (though damned if I can recall the details without looking it up, and I’m getting a bit brain fried tired, so not up to doing so).

Anticipation, be it fearful or happy, definitely shifts how we perceive time.