Gregorian ↔ Lunar ConversionA precise two-way workflow
Convert civil dates into traditional lunar dates—and back again—without losing leap-month status, weekday, source data, or the boundary checks needed for Chinese New Year and BaZi.
Before converting
原Preserve the original.
A conversion is derived data. Keep the source date and its context beside the result.
What to prepare
The date alone may not be enough.
For ordinary festival lookup, a Gregorian date may be sufficient. For birthdays, historical records, zodiac boundaries, or BaZi, keep the original date, local time, place, timezone, and stated calendar convention.
If the source is already lunar, verify whether it belongs to a leap month. A month number without that flag can identify two different periods in an intercalary year.
Convert the date first. Interpret the zodiac, year pillar, festival, or timing layer only after the boundary is verified.
Direction one
Gregorian → Lunar
Use this route when the source is a civil date and you need its traditional lunar equivalent.
Direction two
Lunar → Gregorian
This route is especially useful for lunar birthdays, festival dates, family records, and historical comparison.
Year, month, and day
Choose Lunar → Gregorian and enter every component from the original traditional record.
Regular or repeated month
If the source month is marked leap, select the leap option before conversion.
Read the civil result
Capture the Gregorian date and weekday returned by the converter.
Match the intended use
For festivals, birthdays, or BaZi, check the appropriate convention and boundary after conversion.
Common cases to watch
Most errors cluster near a boundary.
Near Li Chun
A birth before the exact Beginning of Spring boundary may still belong to the previous BaZi year pillar.
Near Chinese New Year
Verify the CNY date for cultural-year questions, but do not substitute it for Li Chun in BaZi.
Leap month
A missing leap flag can return the corresponding day from the regular month instead.
Historical record
Older documents may omit calendar, region, timezone, or leap status; record uncertainty instead of guessing.
Regional and practical contexts
Choose the converter that matches the tradition.
Mini Lunar Converter
Use for the Chinese lunisolar workflow, leap-month status, and related Lunar Hub references.
Thai Lunar Converter
Use the localized tool for Thai lunar dates and observance context rather than transferring Chinese rules.
Solar-term verification
After date conversion, confirm Li Chun and the relevant solar-term boundaries for pillar work.
Recommended record
Make the conversion auditable.
- Original calendar and exact source date.
- Local time, location, and timezone when relevant.
- Conversion direction and tool used.
- Converted year, month, day, and weekday.
- Leap-month status and any boundary note.
- Date checked and reviewer, for professional files.
Do not do this
Avoid silent transformations.
- Do not overwrite the original date with the converted result.
- Do not omit the leap-month marker.
- Do not label a BaZi year from Chinese New Year alone.
- Do not mix regional calendar conventions.
- Do not present an uncertain historical conversion as exact.
Frequently asked questions
Quick answers.
Next steps
Understand the calendar behind the output.
Convert with context
A correct output preserves the original, the leap flag, and the boundary rule.
The converter supplies the date. Your workflow supplies the context needed to use it correctly.