JS Practice — Built-in Objects

valueOf() — epoch returns 0

📖 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()

Returns the same primitive value as getTime() — milliseconds since the Unix epoch.

Challenge: Verify that new Date(0).valueOf() returns 0.

💡 Hints (1)