A diferent person made this hotel booking system in Excel and after the 2017/2018 year change I'm no longer able to enter new people (or I'm not able to enter dates that are after 2017/12/31). I'm not very good at calendars in Excel so I don't understand why the it won't continue into 2018. I've changed all the names to 'random'. Is there any easy way to extend the calendar one more year?
Best regards,
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