JS Practice — Built-in Objects

toISOString() — includes year 2024

📖 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 year appears at the start of the ISO string.

Challenge: Verify that new Date('2024-01-15T00:00:00.000Z').toISOString() includes '2024'.

💡 Hints (1)

• toISOString() is lossless — the round-trip through a UTC string preserves all information