Vietnamese lunar calendar · UTC+7

🌙 Lunar ↔ Solar Calendar

Convert both ways with the astronomical algorithm used for the official Vietnamese lunar calendar (UTC+7) — with can-chi names, leap months, solar terms and the countdown to Tết.

Solar date

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Month view (lunar overlay)

Small numbers are the lunar date (day/month); ● marks mùng 1, 🌕 marks the full moon (rằm). Click a day to convert it above.

Lunar → solar

Day

Month

leap month

Year (lunar)

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The Vietnamese lunisolar calendar computes new moons and solar terms astronomically at UTC+7 — that's why Tết occasionally differs from the Chinese calendar (UTC+8). A leap month is inserted when a lunar year spans 13 moons; the leap month is the first one containing no major solar term. Algorithm by Hồ Ngọc Đức, valid ~1800–2199.