Ancient Eighteen Flying Stars
Chinese Lunar Birthday Converter: Gregorian to Lunar Date
Convert a Gregorian birth date to its Chinese lunar year, month, day, and leap-month status for dates from 1901 through 2100.
Chinese lunar birthday
Convert a Gregorian birth date to a Chinese lunar birthday
Enter a Gregorian date to see its Chinese lunar year, month, day, and leap-month status.
Direct answer
Enter a valid Gregorian date from 1901 through 2100. The converter returns the corresponding Chinese lunar year name, lunar month, lunar day, and whether that month is a leap month. It runs locally in the browser and does not turn the date into a personality claim, age calculation, or forecast.
How to read it
A Chinese lunar birthday is the same civil day expressed through the traditional Chinese calendar. Because lunar months follow new moons and leap months keep the calendar aligned with the seasons, the lunar month and day cannot be inferred by simply shifting a fixed number of days from the Gregorian date.
This tool is bounded to 1901–2100, the same range published in the Hong Kong Observatory Gregorian–Lunar Calendar Conversion Table. Enter the Gregorian date exactly as recorded. The result preserves the sexagenary year label, numbered lunar month, numbered lunar day, and any leap-month marker so that none of those fields is silently dropped.
The lunar calendar year and the year label used by every astrology method are not automatically the same question. Public lunar-calendar conversion changes year at Lunar New Year. Destin Field’s separate twelve-palace chart applies its documented Li Chun boundary to the chart year stem and branch, while still converting the recorded date for lunar month and day fields.
Use the result to check a family birthday record, understand a converted date shown on a chart, or compare a dated calendar source. If a historical document already gives a lunar date, keep both records visible. Near midnight or across time zones, a date also needs its original birthplace context before it is used for a full chart.
Five checks for a Chinese lunar birthday
1. Enter the recorded Gregorian date
Use the civil date on the birth or family record, without converting it first.
2. Read the lunar year name
The result shows both the related year number and its Chinese stem-branch name.
3. Check month and day
Lunar month and lunar day are returned separately rather than compressed into a zodiac label.
4. Preserve a leap month
If the date belongs to a leap month, the result identifies it explicitly.
5. Keep chart boundaries separate
A chart may apply Li Chun to its year label; that does not change this calendar conversion.
Example
4 January 1994 converts to the Gui-you lunar year, lunar month 11, day 23. By contrast, 22 March 2023 falls on day 1 of a leap second lunar month, so the leap-month marker is essential.
Common misunderstandings
- A lunar birthday is not found by subtracting a fixed number of days.
- A leap month must not be treated as the ordinary month with the same number.
- Calendar conversion does not calculate personality, compatibility, luck, or a complete birth chart.
Reading boundary
This is a calendar reference tool. It does not restore a missing birth record, resolve an uncertain birthplace date, or provide a prediction.
Questions people ask
What is my Chinese lunar birthday?
Enter the Gregorian date on your record. The result gives the corresponding Chinese lunar year, month, day, and leap-month status.
Why is the range limited to 1901–2100?
That is the published range of the Hong Kong Observatory conversion tables used as the public reference boundary for this tool.
Does this calculate my Chinese zodiac sign?
No. It converts the date. The public zodiac animal and a twelve-palace chart use related but distinct conventions explained on separate pages.
Does the date leave my browser?
No. The conversion runs in the current browser and the entered date is not sent or saved by this tool.
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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