In Excel 2010 I have entered thousands of dates using the format 8/12 to indicate August 2012, 1/15 for January 2015, etc.

I need to sort those dates but Excel thinks 8/12 means August 12 of the current year.
How can I mass correct my entries so Excel will sort the dates based on the month (8) and year (12)?


You need to use a formula to correct your numbers, e.g. this one:

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After converting it, you may want to get rid of the old values:

  • select the converted column
    • right click - copy
    • home - paste - values
  • delete the original column.

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