The format() method of Intl.DateTimeFormat instances formats a date according to the locale and formatting options of this Intl.DateTimeFormat object.
Syntax
format(date)
Parameters
date- : The date to format.
Return value
A string representing the given date formatted according to the locale and formatting options of this Intl.DateTimeFormat object.
Examples
Using format
Use the format getter function for formatting a single date, here for
Serbia:
const options = {
weekday: "long",
year: "numeric",
month: "long",
day: "numeric",
};
const dateTimeFormat = new Intl.DateTimeFormat("sr-RS", options);
console.log(dateTimeFormat.format(new Date()));
// "недеља, 7. април 2013."
Using format with map
Use the format getter function for formatting all dates in an array. Note
that the function is bound to the Intl.DateTimeFormat
from which it was obtained, so it can be passed directly to
Array.prototype.map.
const a = [new Date(2012, 8), new Date(2012, 11), new Date(2012, 3)];
const options = { year: "numeric", month: "long" };
const dateTimeFormat = new Intl.DateTimeFormat("pt-BR", options);
const formatted = a.map(dateTimeFormat.format);
console.log(formatted.join("; "));
// "setembro de 2012; dezembro de 2012; abril de 2012"
Avoid comparing formatted date values to static values
Most of the time, the formatting returned by format() is consistent.
However, this might change in the future and isn't guaranteed for all the languages —
output variations are by design and allowed by the specification. Most notably, the IE
and Edge browsers insert bidirectional control characters around dates, so the output
text will flow properly when concatenated with other text.
For this reason you cannot expect to be able to compare the results of
format() to a static value:
let d = new Date("2019-01-01T00:00:00.000000Z");
let formattedDate = Intl.DateTimeFormat(undefined, {
year: "numeric",
month: "numeric",
day: "numeric",
hour: "numeric",
minute: "numeric",
second: "numeric",
}).format(d);
"1.1.2019, 01:00:00" === formattedDate;
// true in Firefox and others
// false in IE and Edge
Note: See also this StackOverflow thread for more details and examples.