This Act replaced local mean time, which had been held to be the legal time since Curtis v. March in 1858, throughout the United Kingdom of Great Britain and Ireland.
Undang-undang ini menggantikan waktu rata-rata lokal, yang telah dianggap waktu hukum sejak Curtis v. March pada tahun 1858, di seluruh Kerajaan Bersatu Britania Raya dan Irlandia.