Description:
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the date function return error.
My timezone is GMT +7 bangkok, hanoi, jakarta.
When i view phpinfo(). the Default timezone is correct GMT+7, but in different city "Asia/Krasnoyarsk".

When i use date("Y-m-d H:i:s");
it return 1 hour a head

When i use date("O"); 
it return 8

but when i use gmdate("Y-m-d H:i:s");
it return correct time. 7hour before my time.

I already use date_default_timezone_set and also set directly in php.ini
but it only fix my timezone only and make other timezone crowd.

Reproduce code:
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date("Y-m-d H:i:s");

Expected result:
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return correct date time

and add more timezone in phpinfo "Asia/bangkok, hanoi, jakarta"