How to evaluate time difference?

Background:

I have counter plugging that’s running for 45 after a date in a table.

What I would like to achieve:

If more than 45 minutes after the date in the table have passed, the page should be automatically redirect to somewhere else.

What I’ve tried so far

When page loads: navigate to a new page, only if current time - date > 45 minutes. It did not work

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