JS Practice — Built-in Objects

setDate() — mutates the date

📖 Usage Example

const d = new Date(2024, 0, 15)
d.setDate(1)
d.getDate()  // → 1

Use setDate() to mutate the day-of-month of a Date object in place and get back the updated timestamp.

Date.prototype.setDate()

The original Date object is changed after calling setDate().

Challenge: Verify the day changes from 15 to 20 after setDate(20).

💡 Hints (1)