Oops. That is a bug in some new code I just added (a bug in the sense that it does not function properly when there is no offset). I will fix that today. You should be able to update from the repository tomorrow. However, what time zone are you in? Or more importantly, what time zone does your server think you're in? Go to /acs-lang/admin/ and let me know.
Thank you Michael. This is the information you asked me for:
Administration of Localization
* Toggle translator mode: On | Off
* Change system locale: Current system locale is English (US) [ en_US ]
* Change system timezone: Current system timezone is UTC
* Look up message
* Import all messages
* Export all messages