No account needed for any tool. A profile just lets you save and pick up later.
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This page exists in all three languages. Each has its own address, so shared links open in the same language.
A calendar page for every day, reminders for the full moon and death anniversaries by the lunar calendar, and every figure shows how it was worked out.
Free, in Vietnamese, English and Chinese.
Coming soon to the App Store and Google Play.
Until then, use it on the web:
Mường Lò Culture and Tourism Festival
Day Nhâm Tý
Month Đinh Dậu
Year Bính Ngọ
Autumnal EquinoxCôn Sơn and Kiếp Bạc Autumn Festival
Day Tân Hợi
Month Đinh Dậu
Year Bính Ngọ
Autumnal EquinoxOpen the app to see the solar and lunar date, the can chi of the day, month and year, the current solar term and any festival on today. Auspicious hours sit right below the page.
Add a small or medium widget to your home screen, on iPhone or Android, to see the lunar date without opening the app.
Set a death anniversary on the lunar calendar once. The app finds its solar date every year and notifies you at 8 am, on the day or a few days ahead.
One person sets it, the whole family is told: invite relatives to the Family calendar with a short code. Only the person who made a reminder can change it.
Reminders and the Family calendar need sign-in with Apple or Google.
The How it is computed screen lays out the input, the formula, each step and the result for the lunar date and the can chi.
Lunar dates follow Vietnam time (UTC+7), using Hồ Ngọc Đức's algorithm and Jean Meeus's astronomical formulas. It is the same engine as the tools on nhatnguyet.org, cross-checked against NASA, IMCCE and USNO data.
Five questions a day on the Vietnamese calendar and festivals, new every day.
The Explore tab has this month's festivals, the 24 solar terms and short lessons on the lunar calendar. The Knowledge tab has articles with their sources marked.
| Feature | Free for good | Nhật Nguyệt PlusComing soon199,000 VND a year, 7-day free trialor 29,000 VND a month |
|---|---|---|
| Calendar and tools | The daily calendar page, every tool, the articles, quizzes and games | Same as free |
| Widgets | Small and medium home screen widgets | A large month widget, solar-term patterns and app icons |
| Reminders | Reminders for the 1st and 15th lunar days and death anniversaries, as many as you like | Same as free |
| Family calendar | One group of up to 3 people, shared reminders | If the group owner has Plus, the group grows to 12 and everyone benefits; several groups; tasks for anniversary days, notes for the offering tray; a printable family year calendar |
| Profiles | Saved profiles for you and one other person; every tool still accepts any birth date | Unlimited profiles, a compatibility table for the whole family |
| Charts and forecasts | Tử Vi, Bát Tự and numerology charts, as on the web | Monthly and yearly forecasts for each profile, with the method, sources and a PDF |
| AI assistant | 20 questions a day | 50 a day; the assistant knows your family's profiles and forecasts |
Plus is not on sale yet. The table shows what it will include at launch. You buy it in the app, and it works on the web too.
No, not to read the calendar, use the tools, read articles or play the quiz. Sign in with Apple or Google to save reminders, use the Family calendar or ask the AI assistant.
No. The app shows no ads, including the free version.
What Nhật Nguyệt collects, where it is kept and how it is deleted is set out on the Data policy page.
In the app: the Me tab, Delete account, then confirm. On the web: the Account page, Settings section. A deleted account cannot be restored.
Coming soon to the App Store and Google Play.
Until then, use it on the web:
