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(c) Faoi réir fho-alt (2) den alt seo, is tréimhse ama gheimhridh chun críocha an Achta seo a bheidh sa tréimhse dar tosach an dó a chlog meán-am Greenwich maidin an Domhnaigh i ndiaidh an ceathrú Satharn i nDeireadh Fómhair, aon bhliain tar éis 1971 agus dar críoch an dó a chlog meán-am Greenwich maidin an Domhnaigh i ndiaidh an tríú Satharn i mí an Mhárta an bhliain ina dhiaidh sin nó, más é Domhnach Cásca an Domhanch sin is déanaí a luaitear, an dó a chlog meán-am Greenwich maidin an Domhnaigh i ndiaidh an dara Satharn i mí Márta an bhliain sin.
( c ) Subject to subsection (2) of this section, the period beginning at two o'clock Greenwich mean time in the morning of the Sunday following the fourth Saturday in October in any year after 1971 and ending either at two o'clock Greenwich mean time in the morning of the Sunday following the third Saturday in the month of March in the following year or, if the last-mentioned Sunday is Easter Day, at two o'clock Greenwich mean time in the morning of the Sunday following the second Saturday in the month of March in that year shall for the purposes of this Act be a period of winter time.