Public holidays
1666, Portugal, Sintra
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | Ano Novo |
| 2 | Friday, 16 April 1666 | Sexta-Feira Santa |
| 3 | Sunday, 25 April 1666 | Dia da Liberdade |
| 4 | Saturday, 1 May 1666 | Dia do Trabalhador |
| 5 | Thursday, 10 June 1666 | Dia de Portugal |
| 6 | Thursday, 17 June 1666 | Corpo de Deus |
| 7 | Tuesday, 29 June 1666 | Dia de São Pedro |
| 8 | Sunday, 15 August 1666 | Assunção |
| 9 | Tuesday, 5 October 1666 | Implantação República |
| 10 | Monday, 1 November 1666 | Todos os Santos |
| 11 | Wednesday, 1 December 1666 | Independência |
| 12 | Wednesday, 8 December 1666 | Imaculada Conceição |
| 13 | Saturday, 25 December 1666 | Natal |