your are comparing time against wrong time string:
change:
'meta-value' => date('Y-m-d', strtotime('-6 hours')), //value of "order-date"
to this
'value' => date('m-d-Y', strtotime('-6 hours')), //value of "order-date"
because your time string is in m-d-Y format and you are check against Y-m-d which is wrong.
NOTE
if above trick doesn’t work then i suggest you to store time in unix time stamp in database. please read these links for more info how to do it and why
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