[Artur_Hopf]

рони,
Dilettante_Pro,

Точно блин, я тупица. Надо было просто вывести минуты в этой функции, что и сделал, всем спасибо:

function dateTime (num) {
    now = new Date();
    year = "" + now.getFullYear();
    month = "" + (now.getMonth() + 1); if (month.length === 1) { month = "0" + month; }
    day = "" + now.getDate(); if (day.length === 1) { day = "0" + day; }
    hour = "" + now.getHours(); if (hour.length === 1) { hour = "0" + hour; }
    minute = "" + now.getMinutes(); if (minute.length === 1) { minute = "0" + minute; }
    second = "" + now.getSeconds(); if (second.length === 1) { second = "0" + second; }
    if(num == 1){
        return day + "." + month + "." + year + " " + hour + ":" + minute + ":" + second;
    };
    if(num == 2){
        return hour + ":" + minute + ":" + second;
    };
    if(num == 3){
        return hour + ":" + minute;
    };
    
    if(num == 4){
        return minute;
    };
}