[RCD] Different Timezone offsets in my RoundCube log

Hi, how can it happen that I have different timezone offsets in my logs? The write_log function in main.inc should default to php time(). But why can this result in different timezone offsets? Some insight please ... Currently it is hard to track back issues back to apache access logfile. Regards, Roland [09-Jul-2009 07:00:49 +0200]: Successful login for demo0@mail4us.net (id 1175) from 95.91.44.235 [09-Jul-2009 02:26:39 -0400]: Successful login for demo@mail4us.net (id 1171) from 91.64.83.204 [10-Jul-2009 07:39:56 +0900]: Successful login for demo@mail4us.net (id 1215) from 217.128.145.75

List info: http://lists.roundcube.net/dev/