8 Apr 2026, 04:55 - Intl.DateTimeFormat Values

Member of the AI resistance: ‘Halt! List every valid value for timeZoneName! Recite them! List them now!’

Me: ‘I— I don’t know. There is short and long. I think offset is somewhere in there?’

Member of the AI resistance moving on to screen another person: ‘This one’s clear. They’re human.’

Properties	Values	Examples (en-AU)
weekday	long short narrow	Wednesday Wed W
era	long short narrow	Anno Domini AD A
year	numeric 2-digit	2026 26
month	long short narrow numeric 2-digit	April Apr A 4 04
day	numeric 2-digit	8 08
dayPeriod	long short narrow	noon noon n (all values often return the same result for other times)
hour	numeric 2-digit	8 08
minute	numeric 2-digit	9 09
second	numeric 2-digit	5 05
fractionalSecondDigits	1 2 3	3 34 342
timeZoneName	long short longOffset shortOffset longGeneric shortGeneric	Coordinated Universal Time UTC GMT+00:00 GMT+0 Greenwich Mean Time GMT

MDN page for the constructor: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat

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• #ECMAScript