22 lines
715 B
Markdown
22 lines
715 B
Markdown
---
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title: lastDateOfMonth
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tags: date,intermediate
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---
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Returns the string representation of the last date in the given date's month.
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- Use `Date.prototype.getFullYear()`, `Date.prototype.getMonth()` to get the current year and month from the given date.
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- Use the `new Date()` constructor to create a new date with the given year and month incremented by `1`, and the day set to `0` (last day of previous month).
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- Omit the argument, `date`, to use the current date by default.
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```js
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const lastDateOfMonth = (date = new Date()) => {
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let d = new Date(date.getFullYear(), date.getMonth() + 1, 0);
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return d.toISOString().split('T')[0];
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};
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```
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```js
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lastDateOfMonth(new Date('2015-08-11')); // '2015-08-30'
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```
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