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fix(isRFC3339): reject impossible calendar dates #2841

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fix(isRFC3339): reject impossible calendar dates #2841

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13 changes: 12 additions & 1 deletion src/lib/isRFC3339.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,18 @@ const fullTime = new RegExp(`${partialTime.source}${timeOffset.source}`);

const rfc3339 = new RegExp(`^${fullDate.source}[ tT]${fullTime.source}$`);

function daysInMonth(year, month) {
if (month === 2) {
return ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) ? 29 : 28;
}
return [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month - 1];
}

export default function isRFC3339(str) {
assertString(str);
return rfc3339.test(str);
if (!rfc3339.test(str)) {
return false;
}
const [, year, month, day] = str.match(/^(\d{4})-(\d{2})-(\d{2})/).map(Number);
return day <= daysInMonth(year, month);
}
7 changes: 7 additions & 0 deletions test/validators.test.js
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Expand Up @@ -12603,9 +12603,16 @@ describe('Validators', () => {
'2010-02-18t00:23:23.33+06:00',
'2010-02-18t00:23:32.33+00:00',
'2010-02-18t00:23:32.33+23:00',
'2020-02-29T14:39:22Z',
'2000-02-29T00:00:00Z',
],
invalid: [
'2010-02-18t00:23:32.33+24:00',
'2021-02-30T00:00:00Z',
'2021-04-31T00:00:00Z',
'2021-06-31T12:00:00Z',
'2021-02-29T00:00:00Z',
'1900-02-29T00:00:00Z',
'2009-05-31 14:60:55Z',
'2010-02-18t24:23.33+0600',
'2009-05-00 1439,55Z',
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