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+---
+title: addDaysToDate
+tags: date,intermediate
+---
+
+Return the date of `n` days from the given date as a string representation.
+
+- Use `new Date()` to create a date object from the first parameter.
+- Use `Date.getDate()` and `Date.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) => {
+  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'
+```