Excel - change how dates are stored

In excel, I have a column where the dates are stored in 2 ways:

1. Single date - 12/1/2002
2.Categorized - 2002, December, single days - these need to be drilled down by checking the "+"

Access imports 1. successfully, but not 2.

Please offer how I can change the format in 2. to 1.

Selecting the entire columns, and changing date format does not work.

exp vgAsked:
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Michael FowlerSolutions ConsultantCommented:
Do you mean the dates are in the format

2002, December, 1
2002, December, 2

If so here is a formula to convert to date format

=DATE(LEFT(A1,4), MONTH(1 & LEFT(TRIM(LEFT(RIGHT(SUBSTITUTE(A1,",",REPT(" ",10)),20),10)),3)), TRIM(RIGHT(RIGHT(SUBSTITUTE(A1,",",REPT(" ",10)),20),10)))

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ProfessorJimJamMicrosoft Excel ExpertCommented:
you can just simply put this formula =TEXT(A1,"YYYY-MMMM-DD")

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