There seems to be a flaw in your logic. If time were not the same and maybe space also, we could not possibly have the months be equal in both places.
And yet they were the same in both places. We can use simple trigonometry to show it. If time were different at the supernova, then we would not see the correct time lag between the supernova explosion and the supernova illuminating the ring of debris:

We have a direct observation of the passage of time in space.
That assumes time is the same. You only see time here and how it unfolds and exists.
You are ignoring the facts.
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