moment().duration().as(String);

npm install moment

const moment = require('moment'); 
  
let durationOne =  
  moment.duration(2, 'days'); 
let durationTwo =  
  moment.duration(5, 'years'); 
let durationThree =  
  moment.duration(450, 'seconds'); 
  
console.log( 
  "durationOne as seconds is:", 
  durationOne.as('seconds') 
) 
console.log( 
  "durationTwo as days is:", 
  durationTwo.as('days') 
) 
console.log( 
  "durationThree as minutes is:", 
  durationThree.as('minutes') 
)

durationOne as seconds is: 172800
durationTwo as days is: 1826
durationThree as minutes is: 7.5

const moment = require('moment'); 
  
let durationA = 
  moment.duration({months: 4, days: 5, hours: 9}); 
let durationB = 
  moment.duration({hours: 72, minutes: 30}); 
let durationC = 
  moment.duration({years: 2, months: 6}); 
  
console.log( 
  "durationA as number of hours is:", 
  durationA.as('hours') 
) 
  
console.log( 
  "durationB as number of days is:", 
  durationB.as('days') 
) 
  
console.log( 
  "durationC as number of years is:", 
  durationC.as('years') 
)

durationA as number of hours is: 3057
durationB as number of days is: 3.0208333333333335
durationC as number of years is: 2.5

const moment = require('moment'); 
  
let duration1 =  
  moment.duration({months: 4, days: 5, hours: 9}); 
let duration2 =  
  moment.duration({hours: 72, minutes: 30}); 
let duration3 =  
  moment.duration({years: 2, months: 6}); 
  
// Shorthand for Hours is 'h' 
console.log( 
  "duration1 as number of hours is:", 
  duration1.as('h') 
) 
  
// Shorthand for Days is 'd' 
console.log( 
  "duration2 as number of days is:", 
  duration2.as('d') 
) 
  
// Shorthand for Years is 'y' 
console.log( 
  "duration3 as number of years is:", 
  duration3.as('y') 
)

duration1 as number of hours is: 3057
duration2 as number of days is: 3.0208333333333335    
duration3 as number of years is: 2.5