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isISOString javascript Code Snippet in 2024

dateintermediate

Last Updated: 8 February 2024

Checks if the given string is valid in the simplified extended ISO format (ISO 8601).

  • Use new Date() to create a date object from the given string.
  • Use Date.prototype.valueOf() and Number.isNaN() to check if the produced date object is valid.
  • Use Date.prototype.toISOString() to compare the ISO formatted string representation of the date with the original string.
const isISOString = val => { const d = new Date(val); return !Number.isNaN(d.valueOf()) && d.toISOString() === val; };
isISOString('2020-10-12T10:10:10.000Z'); // true isISOString('2020-10-12'); // false

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