[Buildbot] #2834: Changes from perforce server not correctly listed in waterfall view since 0.8.9

[Buildbot trac]

#2834: Changes from perforce server not correctly listed in waterfall view since
0.8.9
----------------------+------------------------------------
Reporter:  lunochod   |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.9      |   Keywords:  p4, changes, waterfall
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 After upgrading to version 0.8.9 something mixes up the "Changed at" time
 of the changes. This results in an incorrect occurrence of the changes in
 the waterfall view (the changes are shown 2 hours later as they occur).

 The sources reside in a perforce depot.
 The perforce server uses CEST time zone. Output of "p4 info" is:
 "Server date: 2014/07/10 11:10:47 +0200 CEST"

 Time zone on the buildbot server machine is the same. Output of "date -R"
 is "Thu, 10 Jul 2014 11:12:33 +0200"

 When I look at a specific change on the web interface, I would see for
 instance:
 Change #603
 ...
 Changed at Wed 09 Jul 2014 17:46:58
 ...
 Comments
     Change 21778 by foo at bar on 2014/07/09 15:46:58

 With buildbot 0.8.8 a change would look like:
 Change #550
 ...
 Changed at Thu 12 Jun 2014 14:55:22
 ...
 Comments
     Change 21630 by foo at bar on 2014/06/12 14:55:22

 I tried to use the newly introduced P4Source parameter server_tz. I set it
 to "Europe/Berlin" (hope this is correct). But it didn't changed the
 behaviour.

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Ticket URL: <http://trac.buildbot.net/ticket/2834>
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