Duplicate dates in array

Hi all, I have an array containing a sequence of dates in the following format, for example: Mon 26 Nov 2007 Mon 24 Dec 2007 Mon 31 Dec 2007 Mon 28 Jan 2007 ...and I want to remove any the first element in cases where the Mondays fall in the same month, so in this case I want to be left with: Mon 26 Nov 2007 Mon 31 Dec 2007 Mon 28 Jan 2007 Any ideas on the most efficient way to do it? I am working on using combinations of array_search, in_array and so on and want to avoid regular expressions if I can. Many thanks in advance for any suggestions! -- http://www.web-buddha.co.uk