PHP date processing experience set_PHP tutorial

//Synthesize date from year, month and day
function dateserial($nyear,$nmonth,$nday)
{
return date("Y/n/j",mktime(0,0,0 ,$nmonth,$nday,$nyear));
}

$now_rq=date("Y/n/j");//Go to the current date
$year=date( Y);//Get the year
$month=date(m);//Get the month
$month=date(j);//Get the day

//Get the quarter from the month The first and last day of
switch($month){
case 1:
case 2:
case 3:
$quarter_begin=dateserial($year-1,10,1 );
$quarter_end=dateserial($year-1,12,31);
break;
case 4:
case 5:
case 6:
$quarter_begin=dateserial ($year,1,1);
$quarter_end=dateserial($year,3,31);
break;
case 7:
case 8:
case 9:
$quarter_begin=dateserial($year,4,1);
$quarter_end=dateserial($year,6,30);
break;
case 10:
case 11:
case 12:
$quarter_begin=dateserial($year,7,1);
$quarter_end=dateserial($year,9,30);
break;
}

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