Problem in a test exercise tracker

I have the problem, with of penultimate test:

The date property of any object in the log array that is returned from GET /api/users/:id/logs should be a string… Use the dateString format of the Date API.

My date in first index in log is string, but, the test in “freeCodeCamp” not see that

(Sorry my english)

Well, to back here again, i run again the action/button I've completed this challenge and now, it’s running with success ‘-’

Maybe, the error were because the wrong date caused by UTC, i don’t know, but, now is running : )