Formula Date modification by Rongzo1971

I had this question after viewing modification of formula as i get another problem..

i have another challenge where my database dates are stored in a weird way. please see attached. the formula returns zero

thanks for your help as usual. much appreciated.
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
in F2, try this formula:


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pls try as an array formula (Ctrl+Shitf-Enter)

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EDIT yyyy for years
FloraAuthor Commented:
Thanks Ryan and Rgonzo.

both works fine.  i am just curious on the IFERROR used by Rgonzo.    why the IFERROR used here. what purpose does it serve?
FloraAuthor Commented:
Thank very much.
FloraAuthor Commented:
dear Ryan and Rgonzo.  i have posted a follow up question with sample data which i could not solve by myself.  it looks very complicated to add more condition to the sumproduct.

i really appreciate your help.   here is my question posted
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Microsoft Excel

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