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fractionalSecondDigits option for Intl.DateTimeFormat

Category

JavaScript

Type

New or changed feature

Status

Enabled by default (Chrome 84)

Intent stage

Prepare to ship

Summary

Enhances the Intl.DateTimeFormat API by adding a “ fractionalSecondDigits” option to control the format of fractions of a second.

Motivation

The Date object in ECMAScript stores time information with millisecond precision. Some web developers need to output milliseconds. This option enhances Intl.DateTimeFormat to control formatting of fractions of second. The value of millisecondDigits should be an integer between 0 to 3 to represent how many digits the DateTimeFormat should output after the decimal mark.

Standards & signals

• Specification: https://github.com/tc39/ecma402/pull/347
• Firefox: Positive
• Safari: No signal
• Web developers: No signals
• Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=9284

Docs: https://docs.google.com/document/d/1KXbFOzTsfIHXhk0uw8p8WXIHZ1Bm1xMZXahtDOiK40Q/edit#

Samples: https://docs.google.com/document/d/1KXbFOzTsfIHXhk0uw8p8WXIHZ1Bm1xMZXahtDOiK40Q/edit#

Explainers: https://docs.google.com/document/d/1KXbFOzTsfIHXhk0uw8p8WXIHZ1Bm1xMZXahtDOiK40Q/edit#

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