Ancient Eighteen Flying Stars
Chinese Lunar Date to Gregorian Date Converter
Convert a Chinese lunar year, numbered month, day, and leap-month status to its Gregorian calendar date from 1901 through 2099.
Gregorian calendar result
Convert a Chinese lunar date to a Gregorian date
Enter a lunar year, numbered month, day, and leap-month status. Complete reverse conversion is available from 1901 through 2099.
Direct answer
Choose the Chinese lunar year, month number, day, and whether the month is a leap month. The converter returns the matching Gregorian date for complete lunar years from 1901 through 2099. Leap and regular months with the same number are different dates, so the leap-month setting must match the source record.
How to read it
A Chinese lunar date cannot be converted by replacing the month and day with Gregorian numbers. Lunar months begin on astronomical calendar boundaries, usually contain 29 or 30 days, and a year can include an extra leap month. This tool checks the selected lunar fields against the same Chinese-calendar conversion data used by the forward converter.
Enter the related lunar year, the numbered month from 1 to 12, and the lunar day from 1 to 30. Select leap month only when the original record explicitly marks that month as intercalary. If the chosen day or leap month does not exist in that year, the tool returns no date instead of silently changing the input.
The complete reverse-conversion range is 1901 through 2099. The official tables include Gregorian dates through 2100, but the lunar year 2100 continues into 2101; it is therefore excluded rather than presented as a complete year. The Gregorian result uses the civil ISO date and does not apply a chart method's separate Li Chun year boundary.
A recurring lunar birthday falls on a different Gregorian date in different years. To find a birthday anniversary for another year, keep the lunar month, day, and leap status but select the target lunar year. A birthday recorded in a leap month needs special care because not every year has that leap month.
For a Destin Field chart, use the Gregorian date written in the birth record when it is available. This converter is useful when the source record is lunar only. It performs calendar conversion, not a personality reading, compatibility score, or forecast.
Five checks before converting a lunar date
1. Select the lunar year
Use the year to which the lunar month belongs, not merely the Gregorian year visible near the date.
2. Select the numbered month
Choose month 1 through 12 exactly as written in the lunar record.
3. Enter the lunar day
Lunar months have 29 or 30 days; an impossible day is rejected.
4. Confirm leap-month status
A regular sixth month and a leap sixth month are separate calendar periods.
5. Copy the Gregorian result
Use the returned ISO date when a form specifically asks for a Gregorian civil date.
Example
Lunar year 2026, month 1, day 1 converts to 17 February 2026. Lunar year 2025, leap month 6, day 1 converts to 25 July 2025; clearing the leap-month setting refers to a different sixth month.
Common misunderstandings
- A lunar month number is not the same as a Gregorian month number.
- A leap month is not automatically month 13; it repeats one numbered month.
- A calendar conversion does not determine chart meaning or predict an event.
Reading boundary
This browser-local tool converts calendar fields only. Verify legal, medical, archival, or identity documents against the issuing authority, and do not use the result as a prediction.
Questions people ask
How do I convert a Chinese lunar date to a Gregorian date?
Select the lunar year, month, day, and leap-month status. The tool then returns the matching Gregorian civil date.
Why does the leap-month checkbox matter?
A regular month and a leap month with the same number occur at different times. The wrong setting can return a different date or no valid match.
Why does the converter stop at lunar year 2099?
A complete lunar year 2100 extends into Gregorian 2101, beyond the dated source range used by the tool.
Does my lunar birthday have the same Gregorian date every year?
No. Convert the lunar month and day separately for each target lunar year.
Editorial record
Research sources
Chart positions are calculated from documented rules. The written interpretation explains those positions in modern language. A reply from the site owner is a separate human opinion; neither is presented as a quotation from the historical texts.
- System
- Textual Reconstruction of the Ancient Eighteen Flying Stars System
- Author
- Yilong Cheng
- Source review
- Destin Field source review
- Updated
- Wikisource — Purple Star Astrology, Xu Daozang edition
- Chinese Text Project — Purple Star Astrology, Volume One
- Historical edition — Complete Fine Manuscript of the Eighteen Flying Stars Purple Star Astrology, ISBN 9789866171680 (translated bibliographic title, not the Destin Field system name)
- Hong Kong Observatory — Gregorian–Lunar Calendar Conversion Table
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