I need to add minutes in an specif hour. It is in js. I have a hour = 09:30 and need to add more 30minutes, but the output shows me '10:0', one '0' less.
Soma_minutos: function(hour, minutes) {
// This case  minutes = 30;  hour = 09:30
    var tempo, hora_nova, horas = '';
    tempo     = new Date("T"+hora);
    tempo.setTime(tempo.getTime() + minutos*60000);
    horas     = tempo.getHours().toString(); // 10
    minutos   = tempo.getMinutes().toString(); // 0
    hora_nova = horas + ':' + minutos;
    return hora_nova;
},
 
    