If your PHP scripts do not show the correct time, the reason is that most probably your hosting server is in a different timezone. This can be easily resolved by changing a setting in PHP called date.timezone.
Depending on your location you can set a specific date.timezone value in PHP using the following option which should be added to your local php.ini file:
date.timezone = "US/Central"
The above example assumes you'd like to set the timezone for your PHP scripts to US/Central. The full list of supported time zones is available here and you should simply replace "US/Central" with the desired timezone.
In this article:
you can find additional information on how to change PHP values through cPanel or using a custom php.ini file.
Also you can check this article:
to see how you can set different date.timezone for a single PHP file.
Problems like this and much harder ones are easily solved by SiteGround Technical Support. If you are not already our client, take a look at our web hosting features.