php - How could I insert date from mktime into MySQL? -

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i want insert date in format m-d database. used code 

$date1=date("m-d",mktime(0,0,0,$month1 ,$day1,1));

the date inserted 0000-00-00 in mysql, , don't know why.

i want compare date stored in mysql current month , day. how can done?

mysql date must of form y-m-d . building date m-d form brings invalid date.

if want compare month or day, can use mysql month , dayofmonth functions. example:

$query = "select * table month(datecol) = {$month1} , dayofmonth(datecol) = {$day1}"

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