Ar feadh 31 lá i mí:
(31 lá) / (7 lá / seachtain) = 4.4286 seachtaine = 4 seachtaine + 3 lá
Ar feadh 30 lá i mí:
(30 lá) / (7 lá / seachtain) = 4.2857 seachtaine = 4 seachtaine + 2 lá
Ar feadh 28 lá i mí:
(28 lá) / (7 lá / seachtain) = 4 seachtaine
Ar feadh 29 lá i mí:
(29 lá) / (7 lá / seachtain) = 4.1429 seachtaine = 4 seachtaine + 1 lá
| # | Ainm Míosa | Laethanta i Mí | Seachtainí i Mí | 
|---|---|---|---|
| 1 | Eanáir | 31 lá | 4 seachtaine + 3 lá | 
| 2 | Feabhra | 28 lá (gnáthbhliain) 29 lá (bliain léim) | 4 seachtaine 4 seachtaine + 1 lá | 
| 3 | Márta | 31 lá | 4 seachtaine + 3 lá | 
| 4 | Aibreán | 30 lá | 4 seachtaine + 2 lá | 
| 5 | Bealtaine | 31 lá | 4 seachtaine + 3 lá | 
| 6 | Meitheamh | 30 lá | 4 seachtaine + 2 lá | 
| 7 | Iúil | 31 lá | 4 seachtaine + 3 lá | 
| 8 | Lúnasa | 31 lá | 4 seachtaine + 3 lá | 
| 9 | Meán Fómhair | 30 lá | 4 seachtaine + 2 lá | 
| 10 | Deireadh Fómhair | 31 lá | 4 seachtaine + 3 lá | 
| 11 | Samhain | 30 lá | 4 seachtaine + 2 lá | 
| 12 | Nollaig | 31 lá | 4 seachtaine + 3 lá | 
* bliain léim = 2016/2020/2024 ...
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