Irish calendar

The words for May (Bealtaine), August (Lúnasa) and November (Samhain), are the names of Gaelic religious festivals.

Christianity has also left its mark on the Irish months: the name for December (Nollaig) derives from Latin natalicia 'birthday', referring to the birth of Christ.

suggest that, during Ireland's Gaelic era, the day began and ended at sunset.

[3] Through contact with the Romans, the seven-day week was borrowed by continental Celts, and then spread to the people of Ireland.

[3] In Irish, four days of the week have names derived from Latin, while the other three relate to the fasting done by early Gaelic Christians.