Round
A round in Turf is a period of four or five weeks - which in days gives either 28 or 35 game days.
A new round begins immediately after the previous round has been completed. This shift between rounds is always 12:00 Central European Time or Central European Summer Time (when applicable) on the first Sunday in every month.
When a new round starts all the zones in the game automatically become neutral.
More information about specific rounds can be read here: List of Rounds.