Apart from the everyday Western calendar, the Balinese also use two local calendars, the saka calendar, this is a lunar calendar starting every Nyepi. The Pawukon calendar is a numerica calendar of 210 days per year.
The Pawukon calendar (a piece shown above) is used to determine festival dates.
There are 2 key events in the Pawukon calendar. Nyepi is the day of silence and marks the start of the Saka year and Tilem Kepitu, the last day of the 7th month, is known as Siwa Latri, and is a night dedicated to the god Shiva. Devotees stay up all night and meditate. There are another 24 ceremonial days in the Saka year, usually celebrated at Purnama