I am formatting a Date on PHP using the following code:
$date = "2014-11-01";
$date_formatted = gmdate("Y-m-d", strtotime($date));
When I print them, the formatted date goes a day back. I was quite surprised. I am not simply looking for a solution (there are many for simple stuff like this). I would like to know how that happened.
echo $date . " ---> " . $date_formatted;
//Displays: 2014-11-01 ---> 2014-10-31
It's because you use gmdate. This will give you a date in GMT based on the supplied timestamp.
strtotime will not use GMT by default and instead use your local timezone. So when you call gmdate, it will reduce the date and time by your timezone offset.
To fix this, use date instead of gmdate or set your system's timezone to UTC.