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# dateformat

A node.js package for Steven Levithan's excellent [dateFormat()][dateformat] function.

[![Build Status](https://travis-ci.org/felixge/node-dateformat.svg)](https://travis-ci.org/felixge/node-dateformat)

## Modifications

* Removed the `Date.prototype.format` method. Sorry folks, but extending native prototypes is for suckers.
* Added a `module.exports = dateFormat;` statement at the bottom
* Added the placeholder `N` to get the ISO 8601 numeric representation of the day of the week

## Installation

```bash
$ npm install dateformat
$ dateformat --help
```

## Usage

As taken from Steven's post, modified to match the Modifications listed above:
```js
var dateFormat = require('dateformat');
var now = new Date();

// Basic usage
dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
// Saturday, June 9th, 2007, 5:46:21 PM

// You can use one of several named masks
dateFormat(now, "isoDateTime");
// 2007-06-09T17:46:21

// ...Or add your own
dateFormat.masks.hammerTime = 'HH:MM! "Can\'t touch this!"';
dateFormat(now, "hammerTime");
// 17:46! Can't touch this!

// You can also provide the date as a string
dateFormat("Jun 9 2007", "fullDate");
// Saturday, June 9, 2007

// Note that if you don't include the mask argument,
// dateFormat.masks.default is used
dateFormat(now);
// Sat Jun 09 2007 17:46:21

// And if you don't include the date argument,
// the current date and time is used
dateFormat();
// Sat Jun 09 2007 17:46:22

// You can also skip the date argument (as long as your mask doesn't
// contain any numbers), in which case the current date/time is used
dateFormat("longTime");
// 5:46:22 PM EST

// And finally, you can convert local time to UTC time. Simply pass in
// true as an additional argument (no argument skipping allowed in this case):
dateFormat(now, "longTime", true);
// 10:46:21 PM UTC

// ...Or add the prefix "UTC:" or "GMT:" to your mask.
dateFormat(now, "UTC:h:MM:ss TT Z");
// 10:46:21 PM UTC

// You can also get the ISO 8601 week of the year:
dateFormat(now, "W");
// 42

// and also get the ISO 8601 numeric representation of the day of the week:
dateFormat(now,"N");
// 6
```

### Mask options

Mask | Description
---- | -----------
`d` | Day of the month as digits; no leading zero for single-digit days.
`dd` | Day of the month as digits; leading zero for single-digit days.
`ddd` | Day of the week as a three-letter abbreviation.
`dddd` | Day of the week as its full name.
`m` | Month as digits; no leading zero for single-digit months.
`mm` | Month as digits; leading zero for single-digit months.
`mmm` | Month as a three-letter abbreviation.
`mmmm` | Month as its full name.
`yy` | Year as last two digits; leading zero for years less than 10.
`yyyy` | Year represented by four digits.
`h` | Hours; no leading zero for single-digit hours (12-hour clock).
`hh` | Hours; leading zero for single-digit hours (12-hour clock).
`H` | Hours; no leading zero for single-digit hours (24-hour clock).
`HH` | Hours; leading zero for single-digit hours (24-hour clock).
`M` | Minutes; no leading zero for single-digit minutes.
`MM` | Minutes; leading zero for single-digit minutes.
`N` | ISO 8601 numeric representation of the day of the week.
`o` | GMT/UTC timezone offset, e.g. -0500 or +0230.
`s` | Seconds; no leading zero for single-digit seconds.
`ss` | Seconds; leading zero for single-digit seconds.
`S` | The date's ordinal suffix (st, nd, rd, or th). Works well with `d`.
`l` |  Milliseconds; gives 3 digits.
`L` | Milliseconds; gives 2 digits.
`t`	| Lowercase, single-character time marker string: a or p.
`tt` | Lowercase, two-character time marker string: am or pm.
`T` | Uppercase, single-character time marker string: A or P.
`TT` | Uppercase, two-character time marker string: AM or PM.
`W` | ISO 8601 week number of the year, e.g. 42
`Z` | US timezone abbreviation, e.g. EST or MDT. With non-US timezones or in the
`'...'`, `"..."` | Literal character sequence. Surrounding quotes are removed.
`UTC:` |	Must be the first four characters of the mask. Converts the date from local time to UTC/GMT/Zulu time before applying the mask. The "UTC:" prefix is removed.

### Named Formats

Name | Mask | Example
---- | ---- | -------
`default` | `ddd mmm dd yyyy HH:MM:ss` | Sat Jun 09 2007 17:46:21
`shortDate` | `m/d/yy` | 6/9/07
`mediumDate` | `mmm d, yyyy` | Jun 9, 2007
`longDate` | `mmmm d, yyyy` | June 9, 2007
`fullDate` | `dddd, mmmm d, yyyy` | Saturday, June 9, 2007
`shortTime` | `h:MM TT` | 5:46 PM
`mediumTime` | `h:MM:ss TT` | 5:46:21 PM
`longTime` | `h:MM:ss TT Z` | 5:46:21 PM EST
`isoDate` | `yyyy-mm-dd` | 2007-06-09
`isoTime` | `HH:MM:ss` | 17:46:21
`isoDateTime` | `yyyy-mm-dd'T'HH:MM:ss` | 2007-06-09T17:46:21
`isoUtcDateTime` | `UTC:yyyy-mm-dd'T'HH:MM:ss'Z'` | 2007-06-09T22:46:21Z
## License

[dateformat]: http://blog.stevenlevithan.com/archives/date-time-format
[stevenlevithan]: http://stevenlevithan.com/

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