Top Architect
Dec 31, 2021 · Backend Development
Understanding the Difference Between yyyy and YYYY in Java Date Formatting
The article explains a subtle Java date‑formatting bug where using the week‑based year pattern (YYYY) can incorrectly display the next calendar year for dates at year‑end, demonstrates the issue with sample code, and clarifies why yyyy should be used for ordinary year representation.
BackendJavabug
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