Hello & Welcome to Just Answer,
Sorry I didn't see your question earlier and to hear of any issue with your unit.
From what I have found, there are a couple of different "versions" of these radios sold through different vendors.
Let me send you a link to the manual from one of these vendors, and have you check page 9 where the discussion begins about how to set the clock manually, and then automatically on the following pages.
Click Here --> Unit Manual
NOTE: This is the electronic (PDF) version of the manual, and it should appear on your screen. If it does not, you may need a PDF viewer program for your computer. You can get a no cost viewer at the following link. Just make sure you uncheck any "offers" before clicking the "Install now" button.
I hope this helps. Please let me know if that manual works for you or if you have any more questions.
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Thanks, ***** *****