<?php
$connection = mysqli_connect("localhost","root","","gravity");
for($i=1;$i<13;$i++)
{
  $monthNo = $i;
   if($i<10)
    $monthNo = "0".$i;
 $month = array("","Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
 $d= cal_days_in_month(CAL_GREGORIAN,$i,2018); 
 for($j=1;$j<=$d;$j++)
 {
   $monthDate = $j;
   if($j<10)
    $monthDate = "0".$j; 
   $date = "2018-".$monthNo."-".$monthDate;
   $date_name = $monthDate." ".$month[$i]." 2018";
   $insert = "insert into calendars set
      calendar_date='".date("Y-m-d",strtotime($date))."',
      date_name='$date_name'";
   $result = mysqli_query($connection,$insert) or die("Error in Insertion : ".mysqli_error($connection));
 }
}
?>