Description:
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If i make first letter uppercase in date string "last day of this month", strtotime returns FIRST day.
But same mixed-case string can be parsed correctly in unpredictable order:\

http://codepad.viper-7.com/MclUwk
http://codepad.viper-7.com/ofbYag

Test script:
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<?php
assert(date('d',strtotime('last day of april')) == "30");
assert(date('d',strtotime('last Day of april')) == "30");
// will raise warning
assert(date('d',strtotime('Last Day of april')) == "30");