JS Practice — Built-in Objects

setDate() — returns a number

📖 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()

setDate() returns the new timestamp.

Challenge: Verify that typeof d.setDate(1) returns 'number'.

💡 Hints (1)

• setDate() returns the new timestamp in ms, just like setFullYear() and setMonth()