2014 Ford Focus clock won't set?

I just got an oil change, tire rotation, and a recall fixed on my car at the dealer. The clock is stuck at 10:08 and no matter how much I change it it will not set! I called them and told them what was happening and they told me to disconnect the negative battery cable then reconnect it. Is that really the solution? I'm not a car person but I can't even reach the cable with my wrench because of where it is. Anything else I can do?

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