How to change timezone of date header in Apache?

Question

Apache HTTP Server

Good time,
apache gives this header:

HTTP/1.1 200 OK
Date: Sat, 22 Nov 2014 14:37:45 GMT

How can he tell he's not in London?

php date_default_timezone_set( "..." );
SetEnv TZ "..."

Doesn't work
. Thank you.

Answer 1

No way.
tools.ietf.org/html/rfc2616#section-3.3.1 :

All HTTP date/time stamps MUST be represented in Greenwich Mean Time (GMT), without exception. For the purposes of HTTP, GMT is exactly equal to UTC (Coordinated Universal Time).

Answer 2

Run in terminal:
Then check.