moment js check if date is greater than

let A = moment('2020-01-02');
let B = moment('2020-01-01');
let C = moment('2020-01-03');
console.log(A.diff(B, 'days'));// => 1
console.log(A.diff(C, 'days'));// => -1moment().isSameOrAfter(Moment|String|Number|Date|Array);
moment().isSameOrAfter(Moment|String|Number|Date|Array, String);