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Frequently Asked Questions
Why is the lunar date different from other apps?
This app uses the Vietnamese lunar calendar calculation (UTC+7, Hanoi), which may differ slightly from the Chinese lunar calendar used in other apps.
How do I add a custom special date?
Tap the Special Dates section and use the + button to add a new event. You can set it to repeat by lunar date, solar date, or as a one-time event.
How do I change the language?
Tap the EN or VI button at the top of the main screen to switch between English and Vietnamese.
Does the app work offline?
Yes — all calendar calculations are done on-device. No internet connection is required.
What are Solar Terms (Tiết Khí)?
Solar Terms are 24 traditional divisions of the year used in Vietnamese and East Asian culture, based on the sun's position. They mark seasonal changes and important agricultural periods.
Privacy
Vietnamese Lunar Calendar does not collect, store, or share any personal data. All data (special dates, settings) is stored locally on your device only.