Some time methods in a coffeescript class

time.js.coffee

# Time Class
class @Time
  
  constructor: (@seconds) ->
    
  getElapsedTimeString: (seconds) ->
    currentTimeString = "00:00:00"
    try
      hours = Math.floor(seconds / 3600)
      seconds = seconds % 3600
      minutes = Math.floor(seconds / 60)
      seconds = seconds % 60
      seconds = Math.floor(seconds)
      # Pad the minutes and seconds with leading zeros, if required
      hours = @padTime(hours)
      minutes = @padTime(minutes)
      seconds = @padTime(seconds)
      # Compose the string for display
      currentTimeString = hours + ":" + minutes + ":" + seconds   
    catch error
      alert error.message
    currentTimeString

  # Add zeros to single digit time
  padTime: (num) ->
    ((if num < 10 then "0" else "")) + num

  # Converts time hh:mn:sc into minutes
  timeToMinutes: (time) ->
    total_mn = 0
    try
      hr = parseInt(time.substr(0, 2), 10)
      mn = parseInt(time.substr(3, 2), 10)
      ss = parseInt(time.substr(6, 2), 10)
      total_mn = (hr * 60) + mn
      total_mn = (if ss > 30 then total_mn + 1 else total_mn)   
    catch error
      alert error.message
    total_mn