[Webkit-unassigned] [Bug 231041] New: DateTimeFormat.resolvedOptions shouldn't return an object with other date/time properties if dateStyle or timeStyle are set

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231041

            Bug ID: 231041
           Summary: DateTimeFormat.resolvedOptions shouldn't return an
                    object with other date/time properties if dateStyle or
                    timeStyle are set
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philip.chimento at gmail.com

According to the specification for Intl.DateTimeFormat.prototype.resolvedOptions() (https://tc39.es/ecma402/#sec-intl.datetimeformat.prototype.resolvedoptions) step 5.d, none of the properties in Table 4 (weekday, era, year, month, day, dayPeriod, hour, minute, second, fractionalSecondDigits, timeZoneName) should be present on the returned object if dateStyle or timeStyle are present. JavaScriptCore currently does not implement this step correctly:

> new Intl.DateTimeFormat('en', {dateStyle:'short'}).resolvedOptions().year
"2-digit"

This means you currently cannot always pass the object returned from resolvedOptions() back into the DateTimeFormat constructor as the options argument, for one thing.

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