How to use date_default_timezone_set() function and +1 day to the date in PHP

Question

I have a form that enter a set of dates and the dates will be used for mysql queries. The date has to be $date +1 day when used with mysql query. It works fine except the server returns a warning about using date_default_timezone_set() .

//$date is date captured from an input form
$selected_date = date("Y-m-d", strtotime($date . "+1 days"));

Error message received

Warning: strtotime(): It is not safe to rely on the system's timezone settings.
You are required to use the date.timezone setting or the date_default_timezone_set() function.
In case you used any of those methods and you are still getting this warning,
you most likely misspelled the timezone identifier.
We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.

How can I use date_default_timezone_set() function and add one day to the date selected?

Answer 1

You can set default utc timezone by adding one line. As system time may vary you can define default utc time and create or edit the date

 date_default_timezone_set('UTC');
 $selected_date = date("Y-m-d", strtotime($date . "+1 days"));