Public holidays
1778, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Thursday, 1 January 1778 | New Year's Day |
| 2 | Tuesday, 3 March 1778 | Carnival Tuesday |
| 3 | Friday, 17 April 1778 | Good Friday |
| 4 | Tuesday, 21 April 1778 | Tiradentes Day |
| 5 | Friday, 1 May 1778 | Labour Day |
| 6 | Thursday, 18 June 1778 | Corpus Christi |
| 7 | Monday, 7 September 1778 | Independence Day |
| 8 | Monday, 12 October 1778 | Our Lady of Aparecida |
| 9 | Monday, 19 October 1778 | Piauí Day |
| 10 | Monday, 2 November 1778 | All Souls' Day |
| 11 | Sunday, 15 November 1778 | Republic Proclamation Day |
| 12 | Tuesday, 8 December 1778 | Immaculate Conception |
| 13 | Friday, 25 December 1778 | Christmas Day |