Date validation passes for some xss vectors

I am writing a test for a validator function which checks if a value passed is actually an instance of Date object or not. It returns either true or false. So if I pass a simple date, it passes as true that it is a safe value but now I am trying to test it by passing xss vectors (from this list) but somehow some of them returns true, like this one:

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or this:

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Why is this happening and how can I fix it to return false for xss vectors?

This is the validator function:

const isTimeSafe = (value) => {
    const datetime = new Date(value);

    return (datetime instanceof Date && !isNaN(datetime.valueOf()));
}

Here's the test spec:

it('should return false when isTimeSafe is called with xss vectors', () => {

    const vectors = fs.readFileSync(`xssVectors.txt`).toString().split('\n');
    
    for (vector of vectors) {
       const isSafe = isTimeSafe(vector);

       expect(isSafe).toBe(false);
    }

});