Time GMT down

Periodically time server returned from Apache to PHP is not
Correct.
So to restore must stop and restart.
In logo when the time is correct (12:02:12) appear:
127.0.0.1 - - [31/Mar/2008: 12:02:12 +0200]
When is not correct (10:02:12) appear:
127.0.0.1 - - [31/Mar/2008: 12:02:12 +0000]
It is as if the lost based on local time and not maintain the GMT.
Do it is possible to correct this problem?

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