The Tibco iProcess engine (version 11) fails to correctly interpret database timestamps after changing the time from Daylight Savings Time to Standard (Winter) Time. I issued the following commands to resync/reset the timezone in iProcess. Our time zone in GMT+1.

cd /mnt/tibco/swserver/ourserver/util
swadm SET_ATTRIBUTE 0 ALL 0 TIMEZONE "GMT-1"
swsvrmgr RESYNCTIME

Unfortunately this did not work. So we tried using TIMEZONE attribute "CET-1" and then bounced the iProcess engine which was finally successful. According to the iProcess manual the TIMEZONE value "GMT-1" should be just as good as "CET-1". I am surprised if bouncing the iProcess server makes any difference either.