SYSTEM.TIME.LOCAL is a system variable which provides the current local DateTime value. This is gathered from the computer the script is running on. This means that time values will be different between computers and should only be used for calculations that do not need to be updated between computers IE animating GUIs or local particle effects. This system variable is updated at the beginning of script invocation, and is not updated again during the frame. This provides for fast access to a local date time.