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


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.




Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Positive
  • No signal
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Intent to Prototype url

Intent to Prototype thread

Search tags

Intl, datetimeformat,

Last updated on 2021-12-13