A custom Batman.js filter

duration.coffee

# Transform an integer number of seconds as hours and minutes: 1:45
#
# Put in filters/duration.coffee and do @require('filters', 'duration')
Batman.Filters.formatSecondsAsTime = (value) ->
  seconds = parseInt value, 10
  return '' unless seconds
  hours   = parseInt seconds / 60 / 60, 10
  minutes = parseInt (seconds / 60) % 60, 10
  hours   = '' unless hours > 0
  minutes = '0' + minutes if minutes < 10
  [hours, minutes].join ':'

:-D