Convert minutes to hours Number -> HH:HH

convertMinutesToHours.js

function convertMinsToHours(input) {
  if (typeof input != 'number') {
    return ''
  }
  
  const m = input < 0 ? -1 : 1
  const k = Math.floor(input*m % 60)
  const b = Math.floor(input*m / 60)

  return (m==-1 ? '-' : '+') + 
    (b<10?'0':'')+String(b) + ':' + 
    (k<10?'0':'')+String(k)
}

/*
* convertMinsToHours(-210)  =>  -03:30
* convertMinsToHours(120)   =>  +02:00
* convertMinsToHours(0)     =>  +00:00
*/