Public holidays
1231, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Wednesday, 1 January 1231 | Confraternização Universal |
| 2 | Tuesday, 11 February 1231 | Terça-feira de Carnaval |
| 3 | Friday, 28 March 1231 | Sexta Feira Santa ou Paixão de Cristo |
| 4 | Monday, 21 April 1231 | Tiradentes |
| 5 | Thursday, 1 May 1231 | Dia do Trabalho |
| 6 | Thursday, 29 May 1231 | Corpus Christi |
| 7 | Sunday, 7 September 1231 | Independência do Brasil |
| 8 | Sunday, 12 October 1231 | Nossa Senhora Aparecida |
| 9 | Sunday, 19 October 1231 | Dia do Piauí |
| 10 | Sunday, 2 November 1231 | Finados |
| 11 | Saturday, 15 November 1231 | Proclamação da República Brasileira |
| 12 | Monday, 8 December 1231 | Dia de Nossa Senhora da Conceição |
| 13 | Thursday, 25 December 1231 | Natal |