Tried to find a manual or user guide online but the Hitachi site doesn't recognise the model for some reason. You'll be happy to know you aren't the only person to ask that question on a forum though, unfortunately the last 3 people who asked it on a link I found didn't get an answer

Will keep trying though

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On our JVC you had to press the "clock" button and then use the remote to input the time but on some units it takes the time from the RDS signal.
I know it took a few mins to work out what to do with the JVC unit, even with the manual