The Dark Times are known as the years encompassing the collapse of the Alliance of Lordaeron, the fall of the Kingdom of Lordaeron, and the disappearance of King Varian Wrynn from the Kingdom of Stormwind. Such were marked as times of great corruption and destruction of social structures throughout the Eastern Kingdoms, and only now has the Grand Alliance begun to recover from them.
These 'dark times' influenced the kingdoms in different ways. Perhaps the kingdom least affected due to its isolation was Gilneas, which was thoroughly walled off from the world. Nevertheless, it was certainly affected - the very beginning of the dark times predates the wall.
Some historians now argue that Gilnean isolationism contributed to the dark times.