Date reformatting help


New Member
Sep 15, 2009
Hello all,

It's been a while since I was last here, but I have a new question that I'm hoping the gurus can help me with. I'm working on an excel doc that has 25k lines of data. One of the columns has a date currently formatted to "mm/dd" and I need to get the format to show "mm/dd/yyyy". If I change the column formatting to the proper formatting, excel doesn't recognize that "mm/dd" is a proper date, it's only seeing it as "nn/nn". Is there a simple solution to adding in the four digit year and the slash mark, so that excel recognizes it as a proper date format? I'm not too concerned about what year it adds because I can use the find/replace to change the years since they are sequential. Any help is appreciated.

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MrExcel MVP
Sep 2, 2009
If you have mm/dd in column A ...
  • Select column A
  • Select from the menu Data\ Text to Columns
    1. Select Delimited and next
    2. De-select all the checkboxes and then next
    3. Select "Date" in the Column data format
    4. Finish

Then you should be able to format column A with any date format you like.

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