Calendar-Date Validation Rejects Impossible Dates Like 2026-02-31 Instead of Rolling Them Over

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A developer explains that converting date components into a JavaScript Date can silently normalize impossible days, so a valid timestamp does not confirm a real calendar date. For warehouse and Shopify 3PL imports, the article proposes a strict date-only contract accepting exactly YYYY-MM-DD for years 0001 through 9999. The accompanying Node.js script uses Gregorian leap-year rules and month lengths to reject values like 2026-02-31 and century edge cases, and runs boundary checks. The author notes the helper does not handle appointment times, timezones, or operating days, which must be defined separately. The checks run locally and do not demonstrate a deployed warehouse connector or live store integration.

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