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<script type="text/javascript">
alert(new Date(2010,8,31));
alert(new Date(2010,9,1));
</script>
Try the code above. The browser display the same date in both message. Why???
Date(2010,8,31) means “October 1, 2010” and
Date(2010,9,1) also means “October 1, 2010”
Because
in Date(yyyy,mm,dd), mm can be set from 0 to 11 not from 1 to 12
so that if mm is 8 means august and august have 30 days.
on this case, if you input 31 in dd, it points “August 30” + 1