循环减去从某个日期到给定日期的一个月

Question

Am trying to subtract one month from a date backwards to a given date. The code i have written does the subtraction but i don't know why it doesn't complete the loop. below is the code block

$date7 = date('Y-m-10');
$lastsaving = date("2013-2-9"); 


while($lastsaving < $date7){

$newdate = strtotime ( '-1 month' , strtotime ( $date7 ) ) ;
$date7 = date ( 'Y-m-d' , $newdate );


echo $date7; 
echo "<br />";
} 

result i get is

2015-05-10 
2015-04-10 
2015-03-10 
2015-02-10 
2015-01-10 
2014-12-10 
2014-11-10 
2014-10-10 
2014-09-10 
2014-08-10 
2014-07-10 
2014-06-10 
2014-05-10 
2014-04-10 
2014-03-10 
2014-02-10 
2014-01-10 
2013-12-10 

please help me find the reason it's not completing the loop

Answer 1

change

 $lastsaving = date("2013-2-9"); 

to

 $lastsaving = date("2013-02-9"); 

Here, you can see the working one : http://codepad.org/uI0R6TvC

The guy above me is right as well :) that would work too

while(strtotime($lastsaving) < strtotime($date7)) { 

tested here : http://codepad.org/OY36ij3U