gistfile1.coffee

@ServiceLocalTime =
  time_calc: (selector) ->
    date = new Date()
    local_offset = date.getTimezoneOffset() * 60000
    utc = date.getTime() + local_offset
    offset = parseInt(selector.attr('data-tz-offset'))
    time = utc + offset
    new_date = new Date(time)
  
  update_time: (time_element = $('span#service_local_time')) ->    
    time = @time_calc(time_element)
    time_element.html("Local Time: #{time.toLocaleTimeString()}")
    setTimeout ServiceLocalTime.update_time(time_element), 1000


$(document).ready -> ServiceLocalTime.update_time()

gistfile2.coffee

@ServiceLocalTime =
  time_calc: (offset) ->
    date = new Date()
    local_offset = date.getTimezoneOffset() * 60000
    utc = date.getTime() + local_offset
    offset = parseInt(offset)
    time = utc + offset
    new_date = new Date(time)

  update_time: (time_selector) ->
    time_element = $(time_selector)
    offset = parseInt(time_element.attr('data-tz-offset'))
    time = @time_calc(offset)
    time_element.html("Local Time: #{time.toLocaleTimeString()}")

$(document).ready ->
  setInterval (=>ServiceLocalTime.update_time('span#service_local_time')), 1000