Date.prototype.setUTCFullYear() — Description
If you do not specify the monthValue and dateValue parameters, the values returned from the {{jsxref("Date/getUTCMonth", "getUTCMonth()")}} and {{jsxref("Date/getUTCDate", "getUTCDate()")}} methods are used.
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If you do not specify the monthValue and dateValue parameters, the values returned from the {{jsxref("Date/getUTCMonth", "getUTCMonth()")}} and {{jsxref("Date/getUTCDate", "getUTCDate()")}} methods are used.
If a parameter you specify is outside of the expected range, setUTCFullYear() attempts to update the other parameters and the date information in the {{jsxref("Date")}} object accordingly. For example, if you specify 15 for monthValue, the year is incremented by 1 (yearValue + 1), and 3 is used for the month.
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MDN Web Docs — files/en-us/web/javascript/reference/global_objects/date/setutcfullyear/index.md :: Description ↗Revision d14bee540b53 · CC-BY-SA-2.5