Calendars & dates / Java
Weton Calculator: Javanese Weton and Neptu from a Date
Find the Javanese weton of any date, the combination of the seven-day week and the five-day pasaran, with its neptu value, the next date with the same weton, and an optional partner's weton and combined neptu.
Weton Calculator: Javanese Weton and Neptu from a Date: The pasaran cycle of Legi, Pahing, Pon, Wage, and Kliwon runs alongside the week, anchored on 17 August 1945, a Jumat Legi. 1 January 2000 was a Sabtu Legi: Sabtu has neptu 9 and Legi 5, for a total of 14. The same weton returns every 35 days. Runs 100% locally in your browser with zero server file uploads.
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| Day | Neptu | Pasaran | Neptu |
|---|---|---|---|
| Minggu | 5 | Legi | 5 |
| Senin | 4 | Pahing | 9 |
| Selasa | 3 | Pon | 7 |
| Rabu | 7 | Wage | 4 |
| Kamis | 8 | Kliwon | 8 |
| Jumat | 6 | ||
| Sabtu | 9 |
The Javanese calendar runs a five-day market week, the pasaran (Legi, Pahing, Pon, Wage, Kliwon), alongside the seven-day week, so each combination, a weton, returns every 35 days. Each day and pasaran has a number, the neptu, and their sum is used in traditional Javanese primbon for naming, weddings, and choosing dates. The calculation is anchored on 17 August 1945, Indonesia's independence day, a Jumat Legi.
The neptu values
Days: Minggu 5, Senin 4, Selasa 3, Rabu 7, Kamis 8, Jumat 6, Sabtu 9. Pasaran: Legi 5, Pahing 9, Pon 7, Wage 4, Kliwon 8.
Other calendars
To convert between the Gregorian and the Chinese lunar calendar, use the lunar calendar converter.
How to use it
- Enter a date of birth.
- Optionally add a partner's date of birth.
- Read the weton, neptu, and next occurrence.
Privacy & limitations
Everything is calculated in your browser.
Related tools
Frequently asked questions
What is a weton used for?
In Javanese tradition it is the birth day by both weeks, used in primbon to describe character and to choose dates for weddings, moving house, and other events.
What does the combined neptu mean?
For a couple, the two neptu are added and interpreted with primbon tables, which differ between sources; this tool gives the numbers, not the interpretation.
Does the weton change at sunset?
In the traditional Javanese day, the new day begins at sunset, so someone born in the evening may count the next day's weton; this tool uses the calendar date.
Free tool · runs in your browser · no account required