What's wrong with this code??

Hi, I have the following which gets the month and day: $mo = date("m"); $dy = date("d"); Then I have the following IF statements which do something based on the date.. if ($mo == 04 and $dy >= 01 and $dy <= 20) { $wd = "1"; } if ($mo == 04 and $dy >= 21 and $dy <= 27) { $wd = "2"; } if ($mo == 04 and $dy >= 28 or $mo == 5 and $dy <= 04) { $wd = "3"; } if ($mo == 05 and $dy >= 05 and $dy <= 11) { $wd = "4"; } if ($mo == 05 and $dy >= 12 and $dy <= 18) { $wd = "5"; } if ($mo == 05 and $dy >= 19 and $dy <= 25) { $wd = "6"; } if ($mo == 05 and $dy >= 26 or $mo == 06 and $dy <= 01) { $wd = "7"; } ******** Problem lines******** if ($mo == 06 and $dy > 01 and $dy < 09) { $wd = "8"; } if ($mo == 06 and $dy > 08) { $wd = "9"; } The first 7 IF statements work fine ($wd gets the right value if the condition is met), but if I change my date to 06/02 then no matter what I try, $wd always gets the value of 9 (it should be 8 on this date). It should not get the value 9 until the 9th of June. I have checked and $mo and $dy have the proper values. Am I missing something? TIA