Hi all I am using date conversion as bellow 

```
$startdate='12/10/2012'; 
$newstartdate = date('Y-m-d',strtotime($startdate));

```

some time it works but some time it shows **1970-01-01**

Example: 12/10/2012 works
 13/10/2012 does not works shows 1970-01-01