Nest all content into snippets

snippets/js/s/add-days-to-date.md

@@ -0,0 +1,27 @@
+---
+title: Add days to date
+type: snippet
+language: javascript
+tags: [date]
+cover: digital-nomad-12
+dateModified: 2020-11-28T19:18:29+02:00
+---
+
+Calculates the date of `n` days from the given date, returning its string representation.
+
+- Use the `Date` constructor to create a `Date` object from the first argument.
+- Use `Date.prototype.getDate()` and `Date.prototype.setDate()` to add `n` days to the given date.
+- Use `Date.prototype.toISOString()` to return a string in `yyyy-mm-dd` format.
+
+```js
+const addDaysToDate = (date, n) => {
+  const d = new Date(date);
+  d.setDate(d.getDate() + n);
+  return d.toISOString().split('T')[0];
+};
+```
+
+```js
+addDaysToDate('2020-10-15', 10); // '2020-10-25'
+addDaysToDate('2020-10-15', -10); // '2020-10-05'
+```