1568134 - Add fractionalSecondDigits option to Intl.DateTimeFormat

Status: RESOLVED FIXED

(Core :: JavaScript: Internationalization API, enhancement)

Description

[André Bargull [:anba]]

The spec PR https://github.com/tc39/ecma402/pull/347 adds support for the "fractionalSecondDigits" option to Intl.DateTimeFormat.

Example:

js> new Intl.DateTimeFormat("en", {second:"numeric", fractionalSecondDigits:3}).format(new Date("2019-07-23T00:00:00.123")) 
"0.123"
js> new Intl.DateTimeFormat("en", {second:"numeric", fractionalSecondDigits:2}).format(new Date("2019-07-23T00:00:00.023")) 
"0.02"

Comment 1

[André Bargull [:anba]]

Attachment: Bug 1568134: Add support for "fractionalSecondDigits" option to Intl.DateTimeFormat. r=jwalden!

Nightly-only for now until the open spec issues are addressed.

Drive-by change:
Implement the "unknown" parts change from https://github.com/tc39/ecma402/pull/245.

Comment 2

[André Bargull [:anba]]

Try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=60e36f038c4e5eca7b086b38df7853c9fb684719

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/74572aae39b0
Add support for "fractionalSecondDigits" option to Intl.DateTimeFormat. r=jwalden

Comment 4

[Bogdan Tara[:bogdan_tara | bogdant]]

https://hg.mozilla.org/mozilla-central/rev/74572aae39b0

Comment 5

[André Bargull [:anba]]

From https://github.com/tc39/ecma402/pull/347#issuecomment-515874110:

I've filed the following two ICU bug reports:

• https://unicode-org.atlassian.net/browse/ICU-20738
• https://unicode-org.atlassian.net/browse/ICU-20739

Comment 6

[LouisAime]

As of today with Firefox 81.0 (64 bits) for Windows: fractionalSecondDigits option of Intl.DateTimeFormat does not work.
On console:
D = new Date(Date.UTC(2020,8,15,12,15,30,550));
F = new Intl.DateTimeFormat("en-GB",{second : "numeric", fractionalSecondDigits : "3"});
F.format(D); // => 30, should be 30.550

The very same sequence works on MS Edge and Chrome.

Comment 7

[Jeff Walden [:Waldo]]

It's enabled in nightly builds only right now. Bug 1645107 will enable it in shipping builds.