https://github.com/dashed/dayofweek
Port of dayofweek function given by Tomohiko Sakamoto on the comp.lang.c Usenet newsgroup in 1993.
https://github.com/dashed/dayofweek
date day dayofweek javascript week
Last synced: 1 day ago
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Port of dayofweek function given by Tomohiko Sakamoto on the comp.lang.c Usenet newsgroup in 1993.
- Host: GitHub
- URL: https://github.com/dashed/dayofweek
- Owner: dashed
- License: unlicense
- Created: 2017-09-21T07:28:31.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2019-04-12T23:14:55.000Z (about 7 years ago)
- Last Synced: 2025-03-06T18:50:22.404Z (about 1 year ago)
- Topics: date, day, dayofweek, javascript, week
- Language: JavaScript
- Homepage:
- Size: 663 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
dayofweek [](https://travis-ci.org/dashed/dayofweek) [](https://www.npmjs.com/package/dayofweek)
=========
[](https://greenkeeper.io/)
> Get the day of the week given year, month, and day.
>
> Port of dayofweek function given by Tomohiko Sakamoto on the comp.lang.c Usenet newsgroup
> into JavaScript.
>
> See: https://groups.google.com/forum/#!msg/comp.lang.c/m4YG7Uw72Ic/WQj-pRNzJaIJ
How it works: https://www.quora.com/How-does-Tomohiko-Sakamotos-Algorithm-work
## Install
```sh
$ yarn add dayofweek
# npm v5+
$ npm install dayofweek
# before npm v5
$ npm install --save dayofweek
```
## Usage
```js
const dayofweek = require('dayofweek');
// API
// dayofweek(year, month, day[, translate = true])
// Invariants as per Tomohiko Sakamoto's original implementation.
// * year > 1752
// * 1 <= month <= 12
// * 1 <= day <= 31
// By default returns days of the week.
dayofweek(2017, 6, 16);
dayofweek(2017, 6, 16, true);
dayofweek(2017, 6, 16, 'long');
// → Friday
// Setting translate = 'short' will return shorthand form of the days of the week.
dayofweek(2017, 6, 16, 'short');
// → Fri
// Setting translate = false will return an integer representation of the day of the week.
// i.e. 0=Sun, 1=Mon, ..., 6=Sat
dayofweek(2017, 6, 16, false);
// → 5
// You can pass a translate function. This function will be given the integer
// representation of the day of the week. See above.
dayofweek(2017, 6, 16,
day_index =>
// days of the week in Spanish
[
"lunes",
"martes",
"miércoles",
"jueves",
"viernes",
"sábado",
"domingo"
][day_index]
);
// → sábado
// Or you can pass an array.
dayofweek(2017, 6, 16,
// days of the week in Spanish
["lunes", "martes", "miércoles", "jueves", "viernes", "sábado", "domingo"]
);
// → sábado
```
License
=======
Public Domain.