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snippets/js/s/yesterday.md

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+---
+title: Date of yesterday
+type: snippet
+language: javascript
+tags: [date]
+cover: travel-mug-2
+dateModified: 2020-10-22T20:24:44+03:00
+---
+
+Results in a string representation of yesterday's date.
+
+- Use the `Date` constructor to get the current date.
+- Decrement it by one using `Date.prototype.getDate()` and set the value to the result using `Date.prototype.setDate()`.
+- Use `Date.prototype.toISOString()` to return a string in `yyyy-mm-dd` format.
+
+```js
+const yesterday = () => {
+  let d = new Date();
+  d.setDate(d.getDate() - 1);
+  return d.toISOString().split('T')[0];
+};
+```
+
+```js
+yesterday(); // 2018-10-17 (if current date is 2018-10-18)
+```