231545 2021-10-11 17:00:19 -0700 REGRESSION (iOS 15): Intl.DateTimeFormat returns 2 digit years when year is 'numeric' and month is '2-digit' and day is '2-digit' 2021-10-12 14:28:31 -0700 1 1 1 Unclassified WebKit JavaScriptCore Other iPhone / iPad Other RESOLVED DUPLICATE 230827 https://bugs.webkit.org/show_bug.cgi?id=230827 P2 Normal --- 1 matt.carroll139 webkit-unassigned ysuzuki oldest_to_newest 1802891 0 matt.carroll139 2021-10-11 17:00:19 -0700 This test case passes: ``` const dtf = new Intl.DateTimeFormat('en-AU', { timeZone: 'Australia/Melbourne', year: 'numeric' }); const date = new Date(2021, 9, 2); const parts = dtf.formatToParts(date); const year = parts.find(part => part.type === 'year') shouldBe(year.value, "2021") ``` This test case will fail: ``` const dtf = new Intl.DateTimeFormat('en-AU', { timeZone: 'Australia/Melbourne', year: 'numeric', month: '2-digit', day: '2-digit' }); const date = new Date(2021, 9, 2); const parts = dtf.formatToParts(date); const year = parts.find(part => part.type === 'year') shouldBe(year.value, "2021") // actual is "21" ``` 1803388 1 ysuzuki 2021-10-12 14:28:31 -0700 Thanks! This is dupe of bug 230827. *** This bug has been marked as a duplicate of bug 230827 ***