How can I add one month to my date

[NZ_Kiwis]

this is my code and it jumps around

Jan Mar, Apr, Nov,Jun, Jul, Dec

$myDate = $_SESSION['myDate '];

$NewmyDate  = strtotime("+1 Month", $myDate );

$_SESSION['myDate '] = mktime(0, 0, 0, date('m', $NewmyDate ), 01, date('Y', $NewmyDate ));

$Mon = date('M', $NewmyDate );
	if ($Mon == "Jan"){
		echo "Year End";
	} else {
		echo "Date: " . date('M', $NewmyDate ) . " " . date('Y', $NewmyDate );
	}

[Weedpacket]

How do the six month abbreviations you have written relate to the one date the above code prints? For what values of $_SESSION?

If you're trying to get the first day of next month you could just ask [man]strtotime[/man] for the "first day of next month".

But if you're only want to figure out what next month is called if this month is called "Mar", you don't need any date arithmetic to figure it that it must be "Apr".