PHPで日付・時間の操作(現在日時・月末日・うるう年など)

print date("Y/m/d H:i:s") ;

print date("Y/m/d") ;

print date("H:i:s") ;

$t1 = time()+60*30 ;
print date("H:i:s", $t1) ;

$t1 = time()+60*60*24 ;
print date("Y/m/d", $t1) ;

$t1 = time() ;
print date("t", $t1) ;

$dt = mktime(0, 0, 0, 3, 0, 2012) ;
print date("d", $dt) ;

$t1 = time() ;
print date("z", $t1) ;

$t1 = time() ; 
print date("D", $t1) ;

print date("l") ;

$t1 = time()+60*60*24 ;
print date("w") ;

print date("M") ;

print date("F") ;

$t1 = time()+60*60*24*30 ;
print date("Y/m/d", $t1) ;

$t1 = mktime(10, 15, 20, 12, 31, 2011);
print date("Y/m/d H:i:s", $t1) ;

$t1 = mktime(0, 0, 0, 31, 12, 2011);
print date("Y/m/d l", $t1) ;

print date("Y/n/j (D)") ;
2012/2/8 (Wed)

$t1 = time() ;
print date("A h:i:s", $t1) ;

$c1 = checkdate(2, 29, 2012); //有効な年月日
$c2 = checkdate(2, 30, 2012); //不正な年月日

$c1 = checkdate(2, 29, 2012); //2012年はうるう年
$c2 = checkdate(2, 29, 2013);

$dt = mktime(0, 0, 0, 2, 1, 2012) ; // うるう年
$c1 = date("L", $dt) ;
$dt = mktime(0, 0, 0, 2, 1, 2013) ;
$c2 = date("L", $dt) ;

$dt = getdate() ;
print_r($dt);