Fast and concise date formatting routine, using python style format strings.

format-date.coffee

zpad = (s='', n=0)->
  s += ''
  while s.length < n
    s = '0' + s
  s

#Javascript date formatting. Supports a subset of Python's formats for datetime.strptime
#http://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior
months = 'January,February,March,April,May,June,July,August,September,October,November,December'.split(',')
months_abbr = (m.substr(0,3) for m in months)

format_date = (d, format="%Y-%b-%d, %h:%i")->
  map =
    '%b': -> months_abbr[d.getMonth()]
    '%B': -> months[d.getMonth()]
    '%d': -> zpad d.getDate(), 2
    '%e': -> d.getDate()
    '%h': -> zpad d.getHours(), 2
    '%i': -> zpad d.getMinutes(), 2
    '%m': -> zpad d.getMonth(), 2
    '%s': -> zpad d.getSeconds(), 2
    '%Y': -> d.getFullYear()
    '%y': -> zpad d.getYear(), 2
  unless d instanceof Date
    d = new Date d
  
  format.replace /%./g, (match, offset, string)->
    if map[match]
      map[match]()
    else
      match