In Irish Gaelic as a greeting, Dia dhuit! On taking leave Lá maith agat!
In the sense of 'a good day' it's Lá maith.
In Scots Gaelic latha math or latha bréagha.
'Of the day' is an Lae in the Irish language.It's an Latha in (Scottish) Gaelic.
Irish (Gaelic): lá Scottish Gaelic: lathaLá, pronounced like law.
Nollaig chridheil in Scots Gaelic Nollaig shona in Irish Gaelic and Nollag Ghennal in Manx
In Gaelic, you can say "Tha an-diugh air a bhith iongantach." This translates to "This day has been amazing." Gaelic, particularly Scottish Gaelic and Irish Gaelic, has its own unique vocabulary and structure, so the phrasing might vary slightly between the two languages.
Latha na màthraichean
Irish: ar maidin (Scottish) Gaelic: ?
irish: focal an lae
In Irish: leasdeirfiúr. In Scottish Gaelic: leas-phiuthar
Lá Fhéile Pádraig
Lá Fhéile Pádraig
In Irish it's "go Lá an Luain"
Seo é an lá. (Irish)