convert decimal to time.js

decimalToTime.js

Ho to transform a decimal time interval (for example, 1.074 minutes) into its equivalent 'mm:ss' value. 

Here is some JavaScript that will do what you are asking:

function minTommss(minutes){
 var sign = minutes < 0 ? "-" : "";
 var min = Math.floor(Math.abs(minutes))
 var sec = Math.floor((Math.abs(minutes) * 60) % 60);
 return sign + (min < 10 ? "0" : "") + min + ":" + (sec < 10 ? "0" : "") + sec;
}

Examples:

minTommss(3.5)        // "03:30"
minTommss(-3.5)       // "-03:30"
minTommss(36.125)     // "36:125"
minTommss(-9999.999)  // "-9999:59"

You could use moment.js durations, such as

moment.duration(1.234, 'minutes')

//======================================
//not working well with negative numbers
//======================================

function timeStringToFloat(time) {
        var hoursMinutes = time.split(/[.:]/);
        var hours = parseInt(hoursMinutes[0], 10);
        var minutes = hoursMinutes[1] ? parseInt(hoursMinutes[1], 10) : 0;
        //return hours + minutes / 60;
        return (hours + minutes / 60).toFixed(2);
    }