Formats date to a string based on the requested format. See Dart http://api.dartlang.org/docs/releases/latest/intl/DateFormat.html for full formating options.

• medium: equivalent to MMM d, y h:mm:ss a for en_US locale (e.g. Sep 3, 2010 12:05:08 pm)
• short: equivalent to M/d/yy h:mm a for en_US locale (e.g. 9/3/10 12:05 pm)
• fullDate: equivalent to EEEE, MMMM d, y for en_US locale (e.g. Friday, September 3, 2010)
• longDate: equivalent to MMMM d, y for en_US locale (e.g. September 3, 2010)
• mediumDate: equivalent to MMM d, y for en_US locale (e.g. Sep 3, 2010)
• shortDate: equivalent to M/d/yy for en_US locale (e.g. 9/3/10)
• mediumTime: equivalent to h:mm:ss a for en_US locale (e.g. 12:05:08 pm)
• shortTime: equivalent to h:mm a for en_US locale (e.g. 12:05 pm)

Usage:

{{ date_expression | date[:format] }}

@NgFilter(name:'date')
class DateFilter {

 static Map<String, String> MAP = {
   'medium':     'MMM d, y h:mm:ss a',
   'short':      'M/d/yy h:mm a',
   'fullDate':   'EEEE, MMMM d, y',
   'longDate':   'MMMM d, y',
   'mediumDate': 'MMM d, y',
   'shortDate':  'M/d/yy',
   'mediumTime': 'h:mm:ss a',
   'shortTime':  'h:mm a',
 };

 Map<num, NumberFormat> nfs = new Map<num, NumberFormat>();

 /**
  *  [date]: Date to format either as Date object, milliseconds
  *    ([string] or [num]) or various ISO 8601 datetime string formats
  *    (e.g. `yyyy-MM-ddTHH:mm:ss.SSSZ` and its shorter versions like
  *    `yyyy-MM-ddTHH:mmZ`, `yyyy-MM-dd` or `yyyyMMddTHHmmssZ`). If no
  *    timezone is specified in the string input, the time is considered to
  *    be in the local timezone.
  *
  *  [format]: Formatting rules (see Description). If not specified,
  *    mediumDate is used
  *
  */
 call(date, [format = r'mediumDate']) {
   if (date == '' || date == null) return date;
   if (date is String) date = DateTime.parse(date);
   if (date is num) date = new DateTime.fromMillisecondsSinceEpoch(date);
   if (!(date is DateTime)) return date;
   var nf = nfs[format];
   if (nf == null) {
     if (MAP.containsKey(format)) {
       format = MAP[format];
     }
     nf = new DateFormat(format);
   }
   return nf.format(date);
 }
}