php timezone “Etc/GMT+5” equivalent to UTC (“Etc/UTC+5” ?)

问题

I wanted to convert a date in php from UTC format to UTC+5. If it was from GMT to GMT+5 i would simply do:

$date_str = '2011-04-01 12:00:00'; //ex:from database

$date = new DateTime($date_str,new DateTimeZone('GMT'));
$date->setTimezone(new DateTimeZone('Etc/GMT+5'));

echo $date->format('Y-m-d H:i:s'); //testing

In the php timezone lists here, there isn't no 'Etc/UTC+5' equivalent.

Is there a way to do convert from UTC to UTC+5 in php?

or would it make the same result whit the GMT example?

would it be wrong to convert 'UTC' to 'Etc/GMT+5'?

Notes:

• the date I'm actually using (from my database) is in the UTC format.
• I still get a bit confused abut the difference between UTC and GMT time formats.

回答1:

As civil timezones, GMT and UTC are nowadays considered equivalent. Strictly speaking, they are not, but in this context you may more than likely safely pretend that they are.

回答2:

GMT is old and busted, UTC is the new hotness. Other than that, they're equivalent enough to consider interchangeable.

来源：https://stackoverflow.com/questions/5598312/php-timezone-etc-gmt5-equivalent-to-utc-etc-utc5