I love the title, and the idea that time has slipped away – so many possible reasons, and your character’s confusion is believable.

I do think that the actual description of the action seemed a bit fumbled though – not particularly easy to visualise, and without a natural flow. Also, having ‘he thought’ to explain each piece of internal monologue was a bot scrappy.

But the concept, and the realisation that something isn’t quite right was captured well- attention to pacing, and perhaps some detail with regards to the overcast sky, which is ripe for description – could make this an interesting and thought-provoking read… MH :)

I agree with MH on the narrative issues. It’s a really neat idea, and despite the issues the character still comes through as likeable. I think you can clean it up by double checking grammar/sentence structure stuff and maybe sneaking in that he went to the park for some reason, as it kind of just pops up out of nowhere these references to a park.