php checking textbox containing a date field -


im using php , im checking if textbox empty (this textbox contains date field)

i have 

  $startperiod = date("y-m-d",strtotime($startperiod));    if(empty($startperiod){    //     }

this if statement not work because when date field empty gets defaulted "1969-12-31"

how can fix can check if date field textbox empty?

wrap if condition

if($startperiod != "") {  $startperiod = date("y-m-d",strtotime($startperiod));    if(empty($startperiod){    //     } }

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