setMonth < Date < JavaScript

The setMonth() method of the Date object changes the month for the date according to local time. The month is zero based - January is 0. (The day can be passed/changed, too.)

    
    const event = new Date('July 20, 2020 21:36:00');

    event.setMonth(1);

    const month = event.getMonth();

    console.log(month);
    // 1

    console.log(event.toString());
    // "Thu Feb 20 2020 21:36:00 GMT-0500 (Eastern Standard Time)"