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https://github.com/felixge/node-dateformat

A node.js package for Steven Levithan's excellent dateFormat() function.
https://github.com/felixge/node-dateformat

Last synced: 25 days ago
JSON representation

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

Host: GitHub
URL: https://github.com/felixge/node-dateformat
Owner: felixge
License: mit
Created: 2011-03-13T16:27:09.000Z (over 13 years ago)
Default Branch: master
Last Pushed: 2023-03-31T14:05:02.000Z (over 1 year ago)
Last Synced: 2024-09-19T23:11:39.774Z (about 2 months ago)
Language: JavaScript
Homepage:
Size: 875 KB
Stars: 1,297
Watchers: 24
Forks: 155
Open Issues: 15
Metadata Files:
- Readme: Readme.md
- Contributing: CONTRIBUTING.md
- License: LICENSE

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README

# dateformat

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

## 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
import dateFormat, { masks } from "dateformat";
const 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
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. |
| `DDD` | "Ysd", "Tdy" or "Tmw" if date lies within these three days. Else fall back to ddd. |
| `dddd` | Day of the week as its full name. |
| `DDDD` | "Yesterday", "Today" or "Tomorrow" if date lies within these three days. Else fall back to dddd. |
| `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. |
| `p` | GMT/UTC timezone offset, e.g. -05:00 or +02:30. |
| `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. 4, 42 |
| `WW` | ISO 8601 week number of the year, leading zero for single-digit, e.g. 04, 42 |
| `Z` | US timezone abbreviation, e.g. EST or MDT. For non-US timezones, the GMT/UTC offset is returned, e.g. GMT-0500 |
| `'...'`, `"..."` | 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 |
| `paddedShortDate` | `mm/dd/yyyy` | 06/09/2007 |
| `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:sso` | 2007-06-09T17:46:21+0700 |
| `isoUtcDateTime` | `UTC:yyyy-mm-dd'T'HH:MM:ss'Z'` | 2007-06-09T22:46:21Z |

### Localization

Day names, month names and the AM/PM indicators can be localized by
passing an object with the necessary strings. For example:

```js
import { i18n } from "dateformat";

i18n.dayNames = [
"Sun",
"Mon",
"Tue",
"Wed",
"Thu",
"Fri",
"Sat",
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
];

i18n.monthNames = [
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec",
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December",
];

i18n.timeNames = ["a", "p", "am", "pm", "A", "P", "AM", "PM"];
```

> Notice that only one language is supported at a time and all strings
> _must_ be present in the new value.

### Breaking change in 2.1.0

- 2.1.0 was published with a breaking change, for those using localized strings.
- 2.2.0 has been published without the change, to keep packages refering to ^2.0.0 to continue working. This is now branch v2_2.
- 3.0.\* contains the localized AM/PM change.

## License

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