Todays Javaneese Cultural Calender exists of a combination of different calender systems. This combination of the 5 day market week and the Arabic/Western 7 day week gives us a cycle of 35 days. With this calender the people find out on what days they will perform what rituals.
The Pasaran - The Javaneese 5-Day Week
Western/Arabic 7-Day week
Senin - Maandag
Selasa - Dinsdag
Rebo - Woensdag
Kemis - Donderdag
Jumat - Vrijdag
Setu - Zaterdag
Minggu/Ahad - Zondag
Next to the specific days for rituals there is also the day of your own birth (Weton)
on that day you could perform a ritual for yourself. To find out when
you will have to calculate back to your birth year and day to find out
your Weton. Just start at a day you know now and go back in steps of 5 weeks (35 dagen).