Weton — Your Javanese Birth Day
Two calendars running at once, and the day-name they make together.
Javanese tradition runs two week-cycles side by side. One is the seven-day week most of the world uses. The other is the pasaran, a five-day market week — Legi, Pahing, Pon, Wage, Kliwon — named for the rotation of village market days. Your weton is the pair of names that landed on the day you were born: Jumat Legi, Senin Pahing, Rabu Kliwon.
Because five and seven share no factors, the two cycles only line up again after thirty-five days. That is why a weton feels more particular than a birthday — your combination returns roughly ten times a year rather than once, and for many families it is the weton, not the calendar date, that marks the occasion worth noting.
Each day and each pasaran carries a number, called neptu. Added together they give a figure between 7 and 18 that traditional reckoning uses when weighing the character of a day. This page gives you the names, the arithmetic, and the temperaments the tradition associates with each — described as what they are, which is inherited cultural interpretation rather than prediction.
How it works
- Enter a birth date — or any date; the calculation works the same for all of them.
- The seven-day weekday and the five-day pasaran are worked out for that date and paired into a weton.
- Each half carries a neptu value; the two are added to give the total the tradition weighs.
- You get the day character, the pasaran character, and what that neptu total is taken to indicate. Nothing is stored and nothing is sent anywhere.
Common questions
- What exactly is a weton?
- It is the pairing of two day-names: your weekday from the seven-day cycle and your pasaran from the five-day market cycle. Together they make names like Selasa Kliwon or Ahad Pon. Because the cycles are five and seven days long and share no common factor, the same pairing comes round every thirty-five days — so a weton is a recurring occasion in a way a birthday is not, and in many Javanese families it is the weton that is marked.
- How is neptu calculated?
- Each weekday carries a value — Ahad 5, Senin 4, Selasa 3, Rabu 7, Kamis 8, Jumat 6, Sabtu 9 — and each pasaran carries one too: Legi 5, Pahing 9, Pon 7, Wage 4, Kliwon 8. Your neptu is simply the two added together, which puts every possible weton between 7 and 18. These numbers are fixed by tradition rather than derived from anything, and they are used when a reading needs to weigh one day against another.
- How do you know the pasaran for a given date?
- The five-day cycle has no astronomical anchor, so it has to be pinned to a date whose pasaran is independently recorded and counted forward or backward from there. This page is anchored on 17 August 1945, the proclamation of Indonesian independence, documented as Jumat Legi, and the arithmetic is checked against further known dates — 1 January 2000 as Sabtu Legi and 1 January 2024 as Senin Pahing — so that a one-day slip in either cycle would be caught rather than shipped.
- Does my weton predict anything about my life?
- No, and this page does not attempt to. What you will find here are the temperaments that tradition associates with each day and pasaran, written as cultural description. Some traditional practice does go further — consulting weton for the timing of a wedding or a move — but that belongs to families and to people with standing in the community, not to a web page, and we do not imitate it. Nothing here forecasts events or comments on anyone's health, money, or relationships.
- Is this the same as a Javanese horoscope?
- Not quite. Weton is a calendar fact before it is anything else — the day names for a given date, arrived at by counting, and two people born on the same day have the same weton regardless of anything else about them. The character readings layered on top are interpretation, and the Javanese calendar tradition they come from is considerably older and more structured than the newspaper-column sense of the word horoscope suggests.
- Can I look up a date other than my birthday?
- Yes. The calculation is the same for any date between 1900 and 2100 — a wedding, a child's birth, the day something happened. Nothing you enter is transmitted or stored; the arithmetic runs in your browser and is gone when the tab closes.
Weton is part of Javanese cultural heritage, presented here for cultural interest. The temperaments described are traditional interpretations passed down in that context, not findings about you, and nothing on this page predicts events, prescribes decisions, or says anything about anyone's health, finances, or relationships. Treat it the way you would any inherited reading of character: worth knowing, not worth obeying.