The Fiestas Patrias (literally Homeland Holidays) of Chile consist of two days, with a third one added on some years:
18 September, in commemoration of the proclamation of the First Governing Body of 1810, and marking the beginning of the Chilean Independence process.
19 September, known as the "Day of the Glories of the Army".
Since 2007, 17 September (if it should be a Monday) or 20 September (if it should be a Friday) will be included as well.
Since 2017, 17 September (if it should be a Friday) will also be included.
Within Chile the Fiestas Patrias are often referred to as the Dieciocho, or "18th" because the celebration occurs on 18 September. Unofficially, the celebration can last for around a week, depending on when it falls.