204 lines
11 KiB
Markdown
204 lines
11 KiB
Markdown
# dateformat
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A node.js package for Steven Levithan's excellent [dateFormat()][dateformat] function.
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## Modifications
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- Removed the `Date.prototype.format` method. Sorry folks, but extending native prototypes is for suckers.
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- Added a `module.exports = dateFormat;` statement at the bottom
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- Added the placeholder `N` to get the ISO 8601 numeric representation of the day of the week
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## Installation
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```bash
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$ npm install dateformat
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$ dateformat --help
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```
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## Usage
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As taken from Steven's post, modified to match the Modifications listed above:
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```js
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import dateFormat, { masks } from "dateformat";
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const now = new Date();
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// Basic usage
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dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
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// Saturday, June 9th, 2007, 5:46:21 PM
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// You can use one of several named masks
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dateFormat(now, "isoDateTime");
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// 2007-06-09T17:46:21
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// ...Or add your own
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masks.hammerTime = 'HH:MM! "Can\'t touch this!"';
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dateFormat(now, "hammerTime");
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// 17:46! Can't touch this!
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// You can also provide the date as a string
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dateFormat("Jun 9 2007", "fullDate");
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// Saturday, June 9, 2007
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// Note that if you don't include the mask argument,
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// dateFormat.masks.default is used
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dateFormat(now);
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// Sat Jun 09 2007 17:46:21
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// And if you don't include the date argument,
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// the current date and time is used
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dateFormat();
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// Sat Jun 09 2007 17:46:22
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// You can also skip the date argument (as long as your mask doesn't
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// contain any numbers), in which case the current date/time is used
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dateFormat("longTime");
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// 5:46:22 PM EST
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// And finally, you can convert local time to UTC time. Simply pass in
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// true as an additional argument (no argument skipping allowed in this case):
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dateFormat(now, "longTime", true);
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// 10:46:21 PM UTC
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// ...Or add the prefix "UTC:" or "GMT:" to your mask.
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dateFormat(now, "UTC:h:MM:ss TT Z");
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// 10:46:21 PM UTC
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// You can also get the ISO 8601 week of the year:
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dateFormat(now, "W");
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// 42
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// and also get the ISO 8601 numeric representation of the day of the week:
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dateFormat(now, "N");
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// 6
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```
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### Mask options
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| Mask | Description |
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| ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `d` | Day of the month as digits; no leading zero for single-digit days. |
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| `dd` | Day of the month as digits; leading zero for single-digit days. |
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| `ddd` | Day of the week as a three-letter abbreviation. |
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| `DDD` | "Ysd", "Tdy" or "Tmw" if date lies within these three days. Else fall back to ddd. |
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| `dddd` | Day of the week as its full name. |
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| `DDDD` | "Yesterday", "Today" or "Tomorrow" if date lies within these three days. Else fall back to dddd. |
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| `m` | Month as digits; no leading zero for single-digit months. |
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| `mm` | Month as digits; leading zero for single-digit months. |
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| `mmm` | Month as a three-letter abbreviation. |
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| `mmmm` | Month as its full name. |
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| `yy` | Year as last two digits; leading zero for years less than 10. |
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| `yyyy` | Year represented by four digits. |
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| `h` | Hours; no leading zero for single-digit hours (12-hour clock). |
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| `hh` | Hours; leading zero for single-digit hours (12-hour clock). |
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| `H` | Hours; no leading zero for single-digit hours (24-hour clock). |
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| `HH` | Hours; leading zero for single-digit hours (24-hour clock). |
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| `M` | Minutes; no leading zero for single-digit minutes. |
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| `MM` | Minutes; leading zero for single-digit minutes. |
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| `N` | ISO 8601 numeric representation of the day of the week. |
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| `o` | GMT/UTC timezone offset, e.g. -0500 or +0230. |
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| `p` | GMT/UTC timezone offset, e.g. -05:00 or +02:30. |
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| `s` | Seconds; no leading zero for single-digit seconds. |
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| `ss` | Seconds; leading zero for single-digit seconds. |
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| `S` | The date's ordinal suffix (st, nd, rd, or th). Works well with `d`. |
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| `l` | Milliseconds; gives 3 digits. |
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| `L` | Milliseconds; gives 2 digits. |
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| `t` | Lowercase, single-character time marker string: a or p. |
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| `tt` | Lowercase, two-character time marker string: am or pm. |
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| `T` | Uppercase, single-character time marker string: A or P. |
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| `TT` | Uppercase, two-character time marker string: AM or PM. |
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| `W` | ISO 8601 week number of the year, e.g. 4, 42 |
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| `WW` | ISO 8601 week number of the year, leading zero for single-digit, e.g. 04, 42 |
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| `Z` | US timezone abbreviation, e.g. EST or MDT. For non-US timezones, the GMT/UTC offset is returned, e.g. GMT-0500 |
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| `'...'`, `"..."` | Literal character sequence. Surrounding quotes are removed. |
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| `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. |
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### Named Formats
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| Name | Mask | Example |
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| ----------------- | ------------------------------ | ------------------------ |
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| `default` | `ddd mmm dd yyyy HH:MM:ss` | Sat Jun 09 2007 17:46:21 |
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| `shortDate` | `m/d/yy` | 6/9/07 |
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| `paddedShortDate` | `mm/dd/yyyy` | 06/09/2007 |
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| `mediumDate` | `mmm d, yyyy` | Jun 9, 2007 |
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| `longDate` | `mmmm d, yyyy` | June 9, 2007 |
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| `fullDate` | `dddd, mmmm d, yyyy` | Saturday, June 9, 2007 |
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| `shortTime` | `h:MM TT` | 5:46 PM |
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| `mediumTime` | `h:MM:ss TT` | 5:46:21 PM |
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| `longTime` | `h:MM:ss TT Z` | 5:46:21 PM EST |
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| `isoDate` | `yyyy-mm-dd` | 2007-06-09 |
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| `isoTime` | `HH:MM:ss` | 17:46:21 |
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| `isoDateTime` | `yyyy-mm-dd'T'HH:MM:sso` | 2007-06-09T17:46:21+0700 |
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| `isoUtcDateTime` | `UTC:yyyy-mm-dd'T'HH:MM:ss'Z'` | 2007-06-09T22:46:21Z |
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### Localization
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Day names, month names and the AM/PM indicators can be localized by
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passing an object with the necessary strings. For example:
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```js
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import { i18n } from "dateformat";
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i18n.dayNames = [
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"Sun",
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"Mon",
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"Tue",
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"Wed",
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"Thu",
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"Fri",
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"Sat",
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"Sunday",
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"Monday",
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"Tuesday",
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"Wednesday",
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"Thursday",
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"Friday",
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"Saturday",
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];
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i18n.monthNames = [
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec",
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"January",
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"February",
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"March",
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"April",
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"May",
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"June",
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"July",
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"August",
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"September",
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"October",
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"November",
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"December",
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];
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i18n.timeNames = ["a", "p", "am", "pm", "A", "P", "AM", "PM"];
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```
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> Notice that only one language is supported at a time and all strings
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> _must_ be present in the new value.
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### Breaking change in 2.1.0
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- 2.1.0 was published with a breaking change, for those using localized strings.
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- 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.
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- 3.0.\* contains the localized AM/PM change.
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## License
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(c) 2007-2009 Steven Levithan [stevenlevithan.com][stevenlevithan], MIT license.
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[dateformat]: http://blog.stevenlevithan.com/archives/date-time-format
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[stevenlevithan]: http://stevenlevithan.com/
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