29 lines
795 B
Markdown
29 lines
795 B
Markdown
---
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title: String is ISO formatted date
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type: snippet
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language: javascript
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tags: [date]
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author: chalarangelo
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cover: icebreaker
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dateModified: 2020-11-29T12:16:43+02:00
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---
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Checks if the given string is valid in the simplified extended ISO format (ISO 8601).
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- Use the `Date` constructor to create a `Date` object from the given string.
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- Use `Date.prototype.valueOf()` and `Number.isNaN()` to check if the produced date object is valid.
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- Use `Date.prototype.toISOString()` to compare the ISO formatted string representation of the date with the original string.
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```js
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const isISOString = val => {
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const d = new Date(val);
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return !Number.isNaN(d.valueOf()) && d.toISOString() === val;
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};
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```
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```js
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isISOString('2020-10-12T10:10:10.000Z'); // true
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isISOString('2020-10-12'); // false
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```
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