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fix(isISO8601): pad year to 4 digits in strict validation for years < 1000 #2724

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fix(isISO8601): pad year to 4 digits in strict validation for years < 1000 #2724

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4 changes: 3 additions & 1 deletion src/lib/isISO8601.js
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,9 @@ const isValidDate = (str) => {
const dayString = day ? `0${day}`.slice(-2) : day;

// create a date object and compare
const d = new Date(`${year}-${monthString || '01'}-${dayString || '01'}`);
// pad year to 4 digits to avoid Date() parsing ambiguity for years < 1000
const yearString = `${year}`.padStart(4, '0');
const d = new Date(`${yearString}-${monthString || '01'}-${dayString || '01'}`);
if (month && day) {
return d.getUTCFullYear() === year
&& (d.getUTCMonth() + 1) === month
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