I have created an excel workbook that has about 12 worksheets. In all worksheets I have a column for the date. The date format is set to this: 12-Jan-15. This is my problem: About once every two weeks when I open the spreadsheet the date column is filled with plus signs (######). Somehow, excel automatically changes the date format. When I check the “format cell” option, it shows the format as: “Monday, January 12, 2015”. When I change the format back to “12-Jan-15”, the pound signs go away and the proper format reappears. Could you tell me why excel changes format on its on?
the # signs indicate that the cell isnt big enough to display the data, but I've never come across excel reformatting on its own - if it was a custom format and the settings for that format were changed, this would be a possibility, but my GUESS would be that the cell is not quite wide enough to display all dates in the format you want, so I'd try widening it a little and see if the problem disappears.
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