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javascript/snippets/days-ago.md

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+---
+title: Days ago
+type: snippet
+tags: [date]
+cover: sunrise-over-city
+dateModified: 2022-01-30T11:48:07+03:00
+---
+
+Calculates the date of `n` days ago from today as a string representation.
+
+- Use the `Date` constructor to get the current date.
+- Use `Math.abs()` and `Date.prototype.getDate()` to update the date accordingly and set to the result using `Date.prototype.setDate()`.
+- Use `Date.prototype.toISOString()` to return a string in `yyyy-mm-dd` format.
+
+```js
+const daysAgo = n => {
+  let d = new Date();
+  d.setDate(d.getDate() - Math.abs(n));
+  return d.toISOString().split('T')[0];
+};
+```
+
+```js
+daysAgo(20); // 2020-09-16 (if current date is 2020-10-06)
+```