Calculate one hour addition to start date time for end date time

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Calculate 1 hour form a date , application of this code where we want to set one hour from start date for calculation of end date .
for example : 
         we have a case where we want to set start date for an event so the start date is = 11:10 am then this code calculate one end date which will be 12:10 pm

you can use dateTimeC or dateTimeC2 both has same result . 
  
function dateTimeC(date) {
        var hours = date.getHours();
        var hours = (hours + 24) % 24;
        var mid = 'AM';
        if (hours == 0) {
            hours = 12;
        }
        else if (hours >= 12) {
            hours = hours % 12;
            mid = 'PM';
        }
        console.log(hours + ':00' + mid);
        if (hours == 12 && mid == 'PM') {
            console.log('end time 01:00 AM');
        }
        else {
            console.log('end time', (hours + 1 + ':00 ' + mid));
        }
    }

    console.log('%c Case 1', 'color:red');
    var date = new Date('06/01/2020 11:00:00');
    dateTimeC2(date)

    console.log('%c Case 2', 'color:red');
    var date = new Date('06/01/2020 00:20:00');
    dateTimeC2(date)

    console.log('%c Case 3', 'color:red');
    var date = new Date('06/01/2020 23:20:00');
    dateTimeC2(date)

    function dateTimeC2(date) {
        var dt = date;
        dt.setMinutes(00, 00, 00);
        console.log('start time ', dt.toLocaleTimeString());
        dt.setTime(dt.getTime() + (1 * 60 * 60 * 1000))
        console.log('end time ', dt.toLocaleTimeString())
    }

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