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A Gregorian year and a Chinese lunar year begin on different dates and need not have the same length. A January-to-December window can therefore include the same lunar month and day from two different lunar years. Two matching results are not necessarily duplicates; check the full dates before discarding either one.
Define the window before counting results
The annual finder searches the selected Gregorian year, not a single named lunar year. Its early days may still belong to the previous lunar year, while dates near its end belong to the following lunar cycle. For an independently checkable example, ordinary lunar month 12, day 1 occurs on both 11 January and 31 December in Gregorian 2024. The numeric lunar years differ.
Verify both candidates separately
Put each Gregorian result into the date converter. Compare its lunar year, month, day and leap-month flag with the original request. The month and day should match, and the leap flag must remain the same. This situation is not a licence to combine an ordinary month and its leap counterpart into one birthday condition.
Why a single conversion can miss a date
If you treat a target Gregorian year number as though it were the requested lunar year, you search only one lunar year's date. That can omit a valid occurrence near the beginning of the Gregorian year. A complete annual lookup needs a defined Gregorian start and end, then every matching day inside that window. It should not stop after finding its first candidate.
An annual list is not automatically the next birthday
The annual list can include dates that have already passed. To choose a future reminder, compare every candidate with a clearly stated reference date. If the early occurrence has passed but the late one has not, the later result may be the next candidate. If all this year's candidates have passed, check a later year instead of labelling the first result as upcoming.
Birth dates and completed age are separate checks
When a complete birth date is supplied, candidates before birth are excluded. That personal filter is different from whether the lunar month and day exist in the calendar. Two lunar birthday candidates in a Gregorian year also do not make someone gain two completed years of age. The age calculator follows the Gregorian birth date and its stated anniversary rule.
Keep the family decision alongside the calculation
Save the selected Gregorian year, original lunar month and day, leap flag, full candidate list and chosen celebration date. A family can mark one or both occasions without rewriting the underlying birth record. Do not assume the same pattern repeats at a fixed interval: calculate the actual target year again. Use the lunar birthday finder to reproduce the list and the birthday record guide to organise reminders without losing the distinction between matches and celebrations.