Matching data to dates

Hi guys, wondering if you can help

Column 'A' has a list of dates 1st Jan through to 31st Dec, but over in column 'J' I have a list of various dates that relate to a % value (occupancy). So I may have 11th Jan, followed by a jump to 13th Feb. In column 'K' I have the % value.

What I want to achieve is that in column 'B' returns the value of 'K' only when matching the date. So for instance 1st Jan is not listed in 'J' so a zero/ null returned. But when the date is listed in 'J' the value will be displayed in B. I need it to display both null and valid value in column 'B'.

I hope this makes sense, and hopefully someone can help

Thanks

pls attach a sample file to help will...

Hey guys thanks for help on this even though it was ages ago, I've been on the road so haven't been able to work on my document for some time. But this is what i've been looking for!