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Currently, the `DatePipe` (via `formatDate()`) rounds fractions of a millisecond to the nearest millisecond. This can cause dates that are less than a millisecond before midnight to be incremented to the following day. The [ECMAScript specification](https://www.ecma-international.org/ecma-262/5.1/#sec-15.9.1.11) defines that `DateTime` milliseconds should always be rounded down, so that `999.9ms` becomes `999ms`. This change brings `formatDate()` and so `DatePipe` inline with the ECMAScript specification. Fixes #37989 BREAKING CHANGE: When passing a date-time formatted string to the `DatePipe` in a format that contains fractions of a millisecond, the milliseconds will now always be rounded down rather than to the nearest millisecond. Most applications will not be affected by this change. If this is not the desired behaviour then consider pre-processing the string to round the millisecond part before passing it to the `DatePipe`. PR Close #38009 |
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