JS Practice — Built-in Objects

valueOf() — positive for modern dates

📖 Usage Example

const d = new Date('2024-01-15T00:00:00.000Z')
d.valueOf()  // → 1705276800000
d.valueOf() === d.getTime()  // → true

Use valueOf() to get the millisecond timestamp of a Date; it equals getTime() and is called automatically in arithmetic expressions.

Date.prototype.valueOf()

For any date after 1970, valueOf() returns a positive number.

Challenge: Verify that new Date('2024-01-15T00:00:00.000Z').valueOf() > 0.

💡 Hints (1)