JS Practice — Built-in Objects

toISOString() — epoch string

📖 Usage Example

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

Use toISOString() to serialize a Date as a UTC ISO 8601 string in the format YYYY-MM-DDTHH:mm:ss.sssZ.

Date.prototype.toISOString()

Returns the date as an ISO 8601 string in UTC. The epoch returns '1970-01-01T00:00:00.000Z'.

Challenge: Verify that new Date(0).toISOString() returns '1970-01-01T00:00:00.000Z'.

💡 Hints (1)