Redmine does not recognize DST or is not using the latest values
I have Redmine on my local Linux box where the timezone is Central Time (Canada).
My time zone in Redmine is set appropriately (UTC -600) and all times were logged correctly until last Sunday when the Daylight Savings switched. Now all times are off by 1 hour.
That tells me that Redmine did not realize the change in CST to CDT.
To get around this, I changed my timezone (in Redmine) to be UTC -500 but that is not my preferred solution.
I think switching to TZInfo (found here: http://tzinfo.rubyforge.org/) would be a simple solution to the problem.