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Saying that JSON.parse can do something when it's really just you implementing the transformation from string to date object is a little misleading.

You can make JSON parse arbitrary sublanguages if you're willing to put in the work.

That way you can get different result, as you could actually have date object and date as string stored somewhere. You will need custom strigify callback to differentiate which should be converted back to date on parse and which should be a string.

Still, this is not pure json this way, it's your own transformations

And what do you pass as the reviver argument? Your own function to check a string to see if it's valid IS8601 and parse it? That's just using parse()'s recursive walking of the object: it does no date reviving itself, right?