Why East Asian Nominal Age Calculations Must Follow Lunar New Year, Not Jan 1

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A developer building an age and zodiac calculator discovered that East Asian nominal age (虛歲) cannot be computed with the simple formula of birth year subtracted from current year plus one. Both nominal age and the Chinese zodiac reset on Lunar New Year, which falls in late January or early February, meaning dates near that window are most vulnerable to calculation errors. To handle this accurately, the developer's Vue component uses a hardcoded lookup table of Lunar New Year dates spanning 1930 to 2050, determining which lunar year a given Gregorian date belongs to before computing age or zodiac sign. A single shared helper function is used for both nominal age and zodiac calculations, preventing inconsistencies that would arise if each used a different year boundary. For dates outside the 1930–2050 range, the component falls back to an approximate calculation and displays a warning rather than returning a silently incorrect result.

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