Lunar Calendar Converter (Solar ↔ Lunar)
Estimate the approximate Vietnamese lunar calendar date from a solar (Gregorian) date. Enter a year (2020–2027), month, and day to get the estimated lunar month and day. Note: this uses a simplified approximation based on the Lunar New Year offset — for exact dates, use a dedicated lunar calendar application.
Fill in the fields above and click Calculate to see your results.
How to use
Estimate the approximate Vietnamese lunar calendar date from a solar (Gregorian) date. Enter a year (2020–2027), month, and day to get the estimated lunar month and day. Note: this uses a simplified approximation based on the Lunar New Year offset — for exact dates, use a dedicated lunar calendar application.
How it's calculated
Year Index (offset from 2020)
Internal offset used to look up Lunar New Year day-of-year
Lunar New Year Day-of-Year
Day of year on which Lunar New Year falls (approximate)
Solar Day-of-Year (approximate)
Approximate day of year for the input solar date
Days Since Lunar New Year
Number of days elapsed since Lunar New Year
Estimated Lunar Month
Approximate lunar month (1 = first month after Lunar New Year)
Estimated Lunar Day
Approximate day within the lunar month (1–30)
Examples
May 16, 2026 → approx. Lunar Month 4
- Solar Day:16
- Solar Year:2,026
- Solar Month:5
Feb 17, 2026 → Lunar New Year (Month 1, Day 1)
- Solar Day:17
- Solar Year:2,026
- Solar Month:2
Frequently Asked Questions
What is the Vietnamese lunar calendar?
Why is this an approximation?
What is Lunar New Year (Tết Nguyên Đán)?
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