App or website for sorting a GPX file by date/time

I have a GPX file that somehow has the date/times out of order. Probably created by a “merge.” I once tried a couple of programs that claimed to “merge” GPX files when really they just appended one to another.

Where can I find a program in a web app or for MacOS that will re-order the trackpoints by time in a GPX file?

A web search found two that apparently have been deleted or relocated and one that had confusing documentation (apparently uncorrected errors).

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