Mae awdurdodau lleol a chyrff llywodraethu ysgolion gwirfoddol a gynorthwyir ac ysgolion sefydledig yn cadw’r hawl i bennu dyddiadau tymhorau ar gyfer eu hysgolion. Serch hynny, maent o dan ddyletswydd i gydweithio a chydgysylltu â’i gilydd i sicrhau bod dyddiadau tymor yr un fath neu mor debyg â phosibl (adran 32A o Ddeddf Addysg 2002).
Local authorities and the governing bodies of voluntary aided (VA) and foundation schools retain the right to set term dates for their schools. However, they are under a duty to co-operate and co-ordinate with each other to ensure that term dates are the same or as similar as possible (section 32A of the Education Act 2002).