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Formats `date` to a string based on the requested `format`.

`format` string can be composed of the following elements:

- `'yyyy'`: 4 digit representation of year (e.g. AD 1 => 0001, AD 2010 => 2010)
- `'yy'`: 2 digit representation of year, padded (00-99). (e.g. AD 2001 => 01, AD 2010 => 10)
- `'y'`: 1 digit representation of year, e.g. (AD 1 => 1, AD 199 => 199)
- `'MMMM'`: Month in year (January-December)
- `'MMM'`: Month in year (Jan-Dec)
- `'MM'`: Month in year, padded (01-12)
- `'M'`: Month in year (1-12)
- `'dd'`: Day in month, padded (01-31)
- `'d'`: Day in month (1-31)
- `'EEEE'`: Day in Week,(Sunday-Saturday)
- `'EEE'`: Day in Week, (Sun-Sat)
- `'HH'`: Hour in day, padded (00-23)
- `'H'`: Hour in day (0-23)
- `'hh'`: Hour in am/pm, padded (01-12)
- `'h'`: Hour in am/pm, (1-12)
- `'mm'`: Minute in hour, padded (00-59)
- `'m'`: Minute in hour (0-59)
- `'ss'`: Second in minute, padded (00-59)
- `'s'`: Second in minute (0-59)
- `'.sss' or ',sss'`: Millisecond in second, padded (000-999)
- `'a'`: am/pm marker

- `'Z'`: 4 digit (+sign) representation of the timezone offset (-1200-+1200)

  `format` string can also be one of the following predefined localizable formats:

- `'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)

  `format` string can contain literal values. These need to be escaped by surrounding with single quotes (e.g. `"h 'in the morning'"`). In order to output a single quote, escape it - i.e., two single quotes in a sequence (e.g. `"h 'o''clock'"`).

## Usage

### In HTML Template Binding

    {{ date_expression | date : format}}

### In JavaScript

    $filter('date')(date, format)

### Arguments

Param | Type | Details
--- | --- | ---
date | Date number string | Date to format either as Date object, milliseconds (string or number) 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 (optional) | string | Formatting rules (see Description). If not specified, `mediumDate` is used.

### Returns

string | Formatted string or the input if input is not recognized as date/millis.

## Example

Edit in Plunker

    <span ng-non-bindable>{{1288323623006 | date:'medium'}}</span>:
        <span>{{1288323623006 | date:'medium'}}</span><br>
    <span ng-non-bindable>{{1288323623006 | date:'yyyy-MM-dd HH:mm:ss Z'}}</span>:
       <span>{{1288323623006 | date:'yyyy-MM-dd HH:mm:ss Z'}}</span><br>
    <span ng-non-bindable>{{1288323623006 | date:'MM/dd/yyyy @ h:mma'}}</span>:
       <span>{{'1288323623006' | date:'MM/dd/yyyy @ h:mma'}}</span><br>
    <span ng-non-bindable>{{1288323623006 | date:"MM/dd/yyyy 'at' h:mma"}}</span>:
       <span>{{'1288323623006' | date:"MM/dd/yyyy 'at' h:mma"}}</span><br>

    it('should format date', function() {
      expect(element(by.binding("1288323623006 | date:'medium'")).getText()).
         toMatch(/Oct 2\d, 2010 \d{1,2}:\d{2}:\d{2} (AM|PM)/);
      expect(element(by.binding("1288323623006 | date:'yyyy-MM-dd HH:mm:ss Z'")).getText()).
         toMatch(/2010\-10\-2\d \d{2}:\d{2}:\d{2} (\-|\+)?\d{4}/);
      expect(element(by.binding("'1288323623006' | date:'MM/dd/yyyy @ h:mma'")).getText()).
         toMatch(/10\/2\d\/2010 @ \d{1,2}:\d{2}(AM|PM)/);
      expect(element(by.binding("'1288323623006' | date:\"MM/dd/yyyy 'at' h:mma\"")).getText()).
         toMatch(/10\/2\d\/2010 at \d{1,2}:\d{2}(AM|PM)/);
    });