init

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+* text=auto

.gitignore

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+bower_components
+coverage
+node_modules

.travis.yml

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+git:
+  depth: 1
+branches:
+  except: /^v\d/
+language: node_js
+node_js: node
+script: npm run-script pretest && npm run-script coverage
+after_script:
+  - npm install istanbul-coveralls
+  - node node_modules/.bin/istanbul-coveralls

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Shinnosuke Watanabe
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# count-days-in-month
+
+[![NPM version](https://img.shields.io/npm/v/count-days-in-month.svg)](https://www.npmjs.com/package/count-days-in-month)
+[![Bower version](https://img.shields.io/bower/v/count-days-in-month.svg)](https://github.com/shinnn/count-days-in-month/releases)
+[![Build Status](https://travis-ci.org/shinnn/count-days-in-month.svg?branch=master)](https://travis-ci.org/shinnn/count-days-in-month)
+[![Coverage Status](https://img.shields.io/coveralls/shinnn/count-days-in-month.svg)](https://coveralls.io/r/shinnn/count-days-in-month)
+[![Dependency Status](https://david-dm.org/shinnn/count-days-in-month.svg)](https://david-dm.org/shinnn/count-days-in-month)
+[![devDependency Status](https://david-dm.org/shinnn/count-days-in-month/dev-status.svg)](https://david-dm.org/shinnn/count-days-in-month#info=devDependencies)
+
+Get the number of days in a given month
+
+```javascript
+countDaysInMonth(2016, 11); //=> 31
+countDaysInMonth(2016, 8); //=> 30
+```
+
+## Installation
+
+### Package managers
+
+#### [npm](https://www.npmjs.com/)
+
+```
+npm install count-days-in-month
+```
+
+#### [bower](https://bower.io/)
+
+```
+bower install count-days-in-month
+```
+
+## API
+
+### countDaysInMonth(*fullYear*, *zerBasedMonth*)
+
+*fullYear*: `Number` of [full year](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Date/setFullYear), for example `2016`  
+*zeroBasedMonth*: `Number` of month, zero based (`0`, `1`, ... `11`)   
+Return: `Number` of days
+
+It returns a number of days in the month, considering the year is whether  a leap year or not.
+
+```javascript
+countDaysInMonth(2015, 1); //=> 28
+countDaysInMonth(2016, 1); //=> 29
+```
+
+## License
+
+Copyright (c) 2016 [Shinnosuke Watanabe](https://github.com/shinnn)
+
+Licensed under [the MIT License](./LICENSE).

bower.json

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+{
+  "name": "count-days-in-month",
+  "description": "Get the number of days in a given month",
+  "keywords": [
+    "count",
+    "day",
+    "days",
+    "number",
+    "month",
+    "date"
+  ],
+  "main": "browser.js",
+  "moduleType": "globals",
+  "homepage": "https://github.com/shinnn/count-days-in-month",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/shinnn/count-days-in-month.git"
+  },
+  "authors": [
+    "Shinnosuke Watanabe (https://github.com/shinnn)"
+  ],
+  "dependencies": {
+    "is-natural-number": "^4.0.1"
+  },
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "*.js",
+    "*.json",
+    "*.yml",
+    "coverage",
+    "node_modules"
+  ]
+}

browser.js

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+/*!
+ * count-days-in-month | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/count-days-in-month
+*/
+(function() {
+  'use strict';
+
+  var EXPECTED_YEAR_ARG = ' Expected a number of full year, for example `2016`.';
+  var EXPECTED_MONTH_ARG = ' Expected a zero-based number of month (0-11).';
+
+  window.countDaysInMonth = function countDaysInMonth(fullYear, zeroBasedMonth) {
+    if (typeof fullYear !== 'number') {
+      throw new TypeError(String(fullYear) + ' is not a number.' + EXPECTED_YEAR_ARG);
+    }
+
+    if (!window.isNaturalNumber(fullYear, {includeZero: true})) {
+      throw new RangeError(String(fullYear) + ' is a number, but not a natural number.' + EXPECTED_YEAR_ARG);
+    }
+
+    if (typeof zeroBasedMonth !== 'number') {
+      throw new TypeError(String(zeroBasedMonth) + ' is not a number.' + EXPECTED_MONTH_ARG);
+    }
+
+    if (!window.isNaturalNumber(zeroBasedMonth, {includeZero: true})) {
+      throw new RangeError(String(zeroBasedMonth) + ' is a number, but not a natural number.' + EXPECTED_MONTH_ARG);
+    }
+
+    if (zeroBasedMonth > 11) {
+      throw new RangeError(String(zeroBasedMonth) + ' is larger than 11.' + EXPECTED_MONTH_ARG);
+    }
+
+    var date = new Date();
+    date.setFullYear(fullYear, zeroBasedMonth + 1, 0);
+
+    if (isNaN(date.getTime())) {
+      throw new RangeError(
+        String(fullYear) +
+        ' is too large for JavaScript year. Expected a valid number of full year.'
+      );
+    }
+
+    return date.getDate();
+  };
+})();

index.js

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+/*!
+ * count-days-in-month | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/count-days-in-month
+*/
+'use strict';
+
+var isNaturalNumber = require('is-natural-number');
+
+var EXPECTED_YEAR_ARG = ' Expected a number of full year, for example `2016`.';
+var EXPECTED_MONTH_ARG = ' Expected a zero-based number of month (0-11).';
+
+module.exports = function countDaysInMonth(fullYear, zeroBasedMonth) {
+  if (typeof fullYear !== 'number') {
+    throw new TypeError(String(fullYear) + ' is not a number.' + EXPECTED_YEAR_ARG);
+  }
+
+  if (!isNaturalNumber(fullYear, {includeZero: true})) {
+    throw new RangeError(String(fullYear) + ' is a number, but not a natural number.' + EXPECTED_YEAR_ARG);
+  }
+
+  if (typeof zeroBasedMonth !== 'number') {
+    throw new TypeError(String(zeroBasedMonth) + ' is not a number.' + EXPECTED_MONTH_ARG);
+  }
+
+  if (!isNaturalNumber(zeroBasedMonth, {includeZero: true})) {
+    throw new RangeError(String(zeroBasedMonth) + ' is a number, but not a natural number.' + EXPECTED_MONTH_ARG);
+  }
+
+  if (zeroBasedMonth > 11) {
+    throw new RangeError(String(zeroBasedMonth) + ' is larger than 11.' + EXPECTED_MONTH_ARG);
+  }
+
+  var date = new Date();
+  date.setFullYear(fullYear, zeroBasedMonth + 1, 0);
+
+  if (isNaN(date.getTime())) {
+    throw new RangeError(
+      String(fullYear) +
+      ' is too large for JavaScript year. Expected a valid number of full year.'
+    );
+  }
+
+  return date.getDate();
+};

index.jsnext.js

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+/*!
+ * count-days-in-month | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/count-days-in-month
+*/
+import isNaturalNumber from 'is-natural-number';
+
+var EXPECTED_YEAR_ARG = ' Expected a number of full year, for example `2016`.';
+var EXPECTED_MONTH_ARG = ' Expected a zero-based number of month (0-11).';
+
+export default function countDaysInMonth(fullYear, zeroBasedMonth) {
+  if (typeof fullYear !== 'number') {
+    throw new TypeError(String(fullYear) + ' is not a number.' + EXPECTED_YEAR_ARG);
+  }
+
+  if (!isNaturalNumber(fullYear, {includeZero: true})) {
+    throw new RangeError(String(fullYear) + ' is a number, but not a natural number.' + EXPECTED_YEAR_ARG);
+  }
+
+  if (typeof zeroBasedMonth !== 'number') {
+    throw new TypeError(String(zeroBasedMonth) + ' is not a number.' + EXPECTED_MONTH_ARG);
+  }
+
+  if (!isNaturalNumber(zeroBasedMonth, {includeZero: true})) {
+    throw new RangeError(String(zeroBasedMonth) + ' is a number, but not a natural number.' + EXPECTED_MONTH_ARG);
+  }
+
+  if (zeroBasedMonth > 11) {
+    throw new RangeError(String(zeroBasedMonth) + ' is larger than 11.' + EXPECTED_MONTH_ARG);
+  }
+
+  var date = new Date();
+  date.setFullYear(fullYear, zeroBasedMonth + 1, 0);
+
+  if (isNaN(date.getTime())) {
+    throw new RangeError(
+      String(fullYear) +
+      ' is too large for JavaScript year. Expected a valid number of full year.'
+    );
+  }
+
+  return date.getDate();
+}

package.json

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+{
+  "name": "count-days-in-month",
+  "version": "1.0.0",
+  "description": "Get the number of days in a given month",
+  "repository": "shinnn/count-days-in-month",
+  "author": "Shinnosuke Watanabe (https://github.com/shinnn)",
+  "scripts": {
+    "pretest": "bower i --production && eslint --fix --config @shinnn --ignore-path .gitignore .",
+    "test": "node --strong_mode --throw-deprecation --track-heap-objects test.js | tap-spec",
+    "coverage": "node --strong_mode node_modules/.bin/istanbul cover -x=bower_components/** test.js"
+  },
+  "license": "MIT",
+  "jsnext:main": "index.jsnext.js",
+  "files": [
+    "index.js",
+    "index.jsnext.js"
+  ],
+  "keywords": [
+    "count",
+    "day",
+    "days",
+    "number",
+    "month",
+    "date",
+    "browser",
+    "client-side"
+  ],
+  "dependencies": {
+    "is-natural-number": "^4.0.1"
+  },
+  "devDependencies": {
+    "@shinnn/eslint-config": "^2.4.0",
+    "bower": "^1.7.9",
+    "eslint": "^2.13.1",
+    "istanbul": "^0.4.4",
+    "last-leap-year": "^1.1.1",
+    "require-bower-files": "^3.0.0",
+    "require-from-string": "^1.2.0",
+    "rollup": "^0.33.0",
+    "rollup-plugin-node-resolve": "^1.7.1",
+    "tap-spec": "^4.1.1",
+    "tape": "^4.6.0"
+  }
+}