format unformatted date entries

The attached spreadsheet displays a list of over 15,000 date entries in column 'A'. These dates are not correctly formatted as dates. Do you know how I would go about doing this so I can then sort via date?
date-formatting.xlsx
rob700Asked:
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Naresh PatelFinancial AdviserCommented:
Select A1 & Home Tab - SortSort
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rob700Author Commented:
Please refer to the attached document. This is my point the dates currently are not currently in the correct formate e.g. 01_feb

Sorting this way will not order them by date.

I need to change all of them so they are correctly formatted e.g 01/02/2013.

Then I will be able to sort them correctly via date.

Thanks
Rob
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Rgonzo1971Commented:
Hi,

If all the dates year are the same

you could use a helper's column with this formula

=DATEVALUE(SUBSTITUTE(A2,"_"," ")&" 2014")

Open in new window

Regards
date-formattingV1.xlsx
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NBVCCommented:
Since it seems you want 2013 dates?

Add a helper column with formula:

=EDATE(SUBSTITUTE(A2,"_","/")+0,-12)

copied down.

Then you can copy and paste special > Values over original if desired and delete the helper.

Then sort normally.
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Saqib Husain, SyedEngineerCommented:
Witout a helper column

- Change the computer date to 2013
- Do a search/replace and change all underscores ( _ ) to blank spaces
- Change the computer date back.

This will change all entries to dates in 2013 only.
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