ldapsearch filter

[s_novell]

Hi All,

I just wondering anybody have an idea how to search for attribute value between one value to other value. For example
I want to search for passwordexpdate between 2008-09-25 14:22:22Z and 2008-09-30 14:22:22. I use
(obpasswordcreationdate>=2008-09-25 14:22:22<=2008-09-30 14:22:22), but this filter grabs all the information after 2008-09-27 14:22:22
even after 2008-09-30 14:22:22 though I mentioned <=2008-09-30 14:22:22. Thanks