JS Practice — Built-in Objects

toISOString() — ends with "Z"

📖 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()

The output always ends with "Z" to indicate UTC time.

Challenge: Verify that new Date(0).toISOString().endsWith('Z') is true.

💡 Hints (1)