จะเปลี่ยนวันที่จาก y-m-d เป็น d-m-y อะค่ะ ทำ function เปลี่ยนวันที่ให้เป็น วันเดือนปี

<?php
     function thaidate($tDate) //แปลงวันที่เป็นวันที่ไทย
	{
		$y = substr($tDate, 0, 4) + 543;
		$m = substr($tDate, 5, 2);
		$d = substr($tDate, 8, 9);
		if ($tDate == "")
		{
			return "";
		} else
		{
			return $d . "/" . $m . "/" . $y;
		}
	}
?>

function displaydate($datex) {
	$date_array=explode("-",$datex);
	$y=$date_array[0]+543;
	$m=$date_array[1];
	$d=$date_array[2];
	$displaydate="$d-$m-$y";
	return $displaydate;
}

$datadate = date("Y-m-d");
echo displaydate($datadate);

$dateime = '2009-10-03';
$date = explode('-', $dateime);
$dateime = implode('-', array($date[2], $date[1], $date[0]+543));
echo $dateime;

global $ary_month;
$ary_month = array(
		"TH_ABBR" => array(1=>"ม.ค.", 2=>"ก.พ.", 3=>"มี.ค.", 4=>"เม.ย.", 5=>"พ.ค.", 6=>"มิ.ย.", 7=>"ก.ค.", 8=>"ส.ค.", 9=>"ก.ย.", 10=>"ต.ค.", 11=>"พ.ย.", 12=>"ธ.ค."),
		"TH_FULL" => array(1=>"มกราคม", 2=>"กุมภาพันธ์", 3=>"มีนาคม", 4=>"เมษายน", 5=>"พฤษภาคม", 6=>"มิถุนายน", 7=>"กรกฎาคม", 8=>"สิงหาคม", 9=>"กันยายน", 10=>"ตุลาคม", 11=>"พฤศจิกายน", 12=>"ธันวาคม"),
		"EN_ABBR" => array(1=>"Jan", 2=>"Feb", 3=>"Mar", 4=>"Apr", 5=>"May", 6=>"Jun",7=>"Jul", 8=>"Aug",9=>"Sep", 10=>"Oct", 11=>"Nov", 12=>"Dec"),
		"EN_FULL" => array(1=>"January", 2=>"Febuary", 3=>"March", 4=>"April", 5=>"May", 6=>"June", 7=>"July", 8=>"August", 9=>"September", 10=>"October", 11=>"November", 12=>"December"),
);

function setdatetime($input, $output, $digit_only = false, $month_idx="TH_ABBR"){
	global $ary_month;
	if($input == "0000-00-00 00:00" or $input == "0000-00-00" or $input == "") return "";
	$input = str_replace("/", "-", $input);
	list($ary_date, $ary_time) = explode(' ', $input);
	list($year, $month, $day) = explode('-', $ary_date);
	@list($hour, $min, $sec) = explode(':', $ary_time);
	$thai = (strtoupper(substr($month_idx,0,2)) == "TH")? true : false;
	$year = ($thai)? ($year+543) : $year;
	$ary_tmp = array();
	
	$ary_tmp['YYYY'] = $year;
	$ary_tmp['YY'] = substr($year, 2, 2);
	$ary_tmp['MM'] = ($digit_only)? $month : $ary_month[$month_idx][intval($month)];
	$ary_tmp['DD'] = $day;
	$ary_tmp['HR'] = $hour;
	$ary_tmp['MN'] = $min;
	$ary_tmp['SC'] = $sec;
	return str_replace(array_keys($ary_tmp), array_values($ary_tmp), $output);
}
echo setdatetime(date("Y-m-d H:i:s"),"วันที่ DD MM YYYY เวลา HR:MN:SC");

$arydate = explode('/', $_POST["txtdate"]);
$sqldate = implode('-', array($arydate [2], $arydate [1], $arydate [0]));

<?php
$ddsolved=date("y-m-d");
$date=explode('-',$ddsolved);
$ddsolved=implode('/',array($date[2],$date[1], ($date[0]+543) ));
echo $ddsolved;
?>

<?php
$ddsolved=date("Y-m-d");
$date=explode('-',$ddsolved);
$ddsolved=implode('/',array($date[2],$date[1], ($date[0]+543) ));
echo $ddsolved;
?>

$arydate=explode('/',$_POST["solved_date"]);
$ddsolved = implode('-', array($arydate [2], $arydate [1], $arydate [0]));
//print("$ddsolved");

$sql = "UPDATEproblem_request SET solved_date='$ddsolved',solved_time='$solved_time'
WHERE autono = '$autono' LIMIT 1";

<?php

if ( ereg('^([0-9]{1,2})-([0-9]{1,2})-([0-9]{4})$', $_POST['date']) 
{
    //ผ่าน
}
else 
{
    //ไม่ผ่าน
}

?>