Please be informed that setting a time zone with an Asterisk sign at the end will help in adjusting the Daylight Savings Time (DST) automatically.
So once, the desired time zone with Asterisk sign is selected, the clocks are typically set forward and set back based on your time zones DST. The time related fields like "Created Time", DueBytime etc in the application will be updated accordingly. For example:
(GMT-5:00) Greenwich Mean Time (Europe/London)*
These Time zones are available under:
1. Admin > Sites
2. Admin > Advanced Portal Settings
3. Personalize > Select Time zone: