Time Zone
Your account profile settings allow you to choose the time zone of the dates presented to you. The system gives you the option to use your local time or UTC.
Local time is the time zone you are currently using on your computer.
UTC stands for Universal Time Coordinated. It is the time in Greenwich UK that is unaffected by daylight saving time. This time is used as a reference point by the entire globe.
It is up to you to decide which one suits you better. It is natural to choose your local time as your preferred setting. If your team is spread around the world using a variety of time zones you may find it more convenient to work in UTC so that all team members use the same time references.