Calculating Exact Age in Years, Months and Days from a Birth Date

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A developer building an age gate for a lending product found that dividing day counts by 365 misstated age, letting a 17-year-old pass an 18+ check one day early. Because years and months vary in length, calendar arithmetic must subtract year, month and day components and borrow from the previous month when days go negative. The article shares a Python implementation using calendar.monthrange and a matching Node.js approach. It also notes that leap-day birthdays raise a policy question about the legal birthday that the software cannot settle. The author advises using borrow-based logic and a documented rule for February 29 in any system with legal consequences.

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ProgrammingDEV Community ·

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