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Status](https://gemnasium.com/badges/github.com/MediaComem/chai-iso8601.svg)](https://gemnasium.com/github.com/MediaComem/chai-iso8601)\n[![Build Status](https://travis-ci.org/MediaComem/chai-iso8601.svg?branch=master)](https://travis-ci.org/MediaComem/chai-iso8601)\n[![Coverage Status](https://coveralls.io/repos/github/MediaComem/chai-iso8601/badge.svg?branch=master)](https://coveralls.io/github/MediaComem/chai-iso8601?branch=master)\n[![License](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE.txt)\n\n\u003c!-- START doctoc generated TOC please keep comment here to allow auto update --\u003e\n\u003c!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --\u003e\n\n\n- [Installation](#installation)\n- [Usage](#usage)\n  - [Operators](#operators)\n  - [Margin of error](#margin-of-error)\n\n\u003c!-- END doctoc generated TOC please keep comment here to allow auto update --\u003e\n\nDeveloped at the [Media Engineering Institute](http://mei.heig-vd.ch) ([HEIG-VD](https://heig-vd.ch)).\n\n\n\n## Installation\n\n```bash\n$\u003e npm install --save-dev chai-iso8601\n```\n\n\n\n## Usage\n\nBasic usage allows you to check that a string is a valid ISO-8601 date and represents the expected time.\n\n```js\nconst chai = require('chai');\n\n// Note the extra call (chai-iso8601 returns a factory function).\nchai.use(require('chai-iso8601')());\n\n// Simple usage\nconst expectedDateString = '2001-01-01T00:00:00Z';\nchai.expect('2001-01-01T00:00:00Z').to.be.iso8601(expectedDateString);\n\n// With a date object\nconst expectedDate = new Date(2001, 0, 1, 0, 0, 0, 0);\nchai.expect('2001-01-01T00:00:00Z').to.be.iso8601(expectedDate);\n\n// With a moment object\nconst expectedMoment = require('moment')('2001-01-01T00:00:00Z');\nchai.expect('2001-01-01T00:00:00Z').to.be.iso8601(expectedMoment);\n```\n\n### Operators\n\n**chai-iso8601** includes operators to perform more complex assertions on dates.\nAll the following assertions will pass:\n\n```js\n// Check that a string is an ISO-8601 date that is equal to another date (this is the default operator used above).\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('eq', '2000-01-01T00:00:00Z');\n\n// Check that a string is an ISO-8601 date that is after another date (and not the same).\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('gt', '1999-12-31T23:59:00Z');\n\n// Check that a string is an ISO-8601 date that is after or the same as another date.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('gte', '2000-01-01T00:00:00Z');\nchai.expect('2001-01-01T00:00:00Z').to.be.iso8601('gte', '2000-01-01T00:00:00Z');\n\n// Check that a string is an ISO-8601 date that is before another date (and not the same).\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('lt', '2001-01-01T00:00:00Z');\n\n// Check that a string is an ISO-8601 date that is before or the same as another date.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('lte', '2000-01-01T00:00:00Z');\nchai.expect('1999-01-01T00:00:00Z').to.be.iso8601('lte', '2000-01-01T00:00:00Z');\n```\n\n### Margin of error\n\nYou may pass an additional number representing a margin of error that the date must be within.\nThis can be useful in tests if you know the approximate value of a date but not its exact value.\n\nUsing a margin changes the behavior of the operators. All the following assertions will pass:\n\n```js\n// Check that a string is an ISO-8601 date that is equal to another date with a margin of one second.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('eq', '2000-01-01T00:00:00Z', 1000);\nchai.expect('1999-12-31T23:59:59Z').to.be.iso8601('eq', '2000-01-01T00:00:00Z', 1000);\nchai.expect('2000-01-01T00:00:01Z').to.be.iso8601('eq', '2000-01-01T00:00:00Z', 1000);\n\n// Check that a string is an ISO-8601 date that is after another date but no more than one second.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('gt', '1999-12-31T23:59:59Z', 1000);\nchai.expect('1999-12-31T23:59:59.666Z').to.be.iso8601('gt', '1999-12-31T23:59:59Z', 1000);\n\n// Check that a string is an ISO-8601 date that is after or the same as another date but no more than one second.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('gte', '2000-01-01T00:00:00Z', 1000);\nchai.expect('2000-01-01T00:00:01Z').to.be.iso8601('gte', '2000-01-01T00:00:00Z', 1000);\n\n// Check that a string is an ISO-8601 date that is before another date but no more than one second.\nchai.expect('1999-12-31T29:59:59Z').to.be.iso8601('lt', '2000-01-01T00:00:00Z');\nchai.expect('1999-12-31T29:59:59.666Z').to.be.iso8601('lt', '2000-01-01T00:00:00Z');\n\n// Check that a string is an ISO-8601 date that is before or the same as another date but no more than one second.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('lte', '2000-01-01T00:00:00Z', 1000);\nchai.expect('1999-12-31T23:59:59.666Z').to.be.iso8601('lte', '2000-01-01T00:00:00Z', 1000);\n```\n\nNote that the following assertions **WILL NOT PASS** although they would without a margin of error:\n\n```js\n// The date is after the specified one, but it exceeds the margin of error of 500 milliseconds.\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('gt', '1999-12-31T23:59:59Z', 500);\nchai.expect('2000-01-01T00:00:00Z').to.be.iso8601('gte', '1999-12-31T23:59:59Z', 500);\n\n// The date is before the specified one, but it exceeds the margin of error of 500 milliseconds.\nchai.expect('1999-12-31T29:59:59Z').to.be.iso8601('lt', '2000-01-01T00:00:00Z', 500);\nchai.expect('1999-12-31T29:59:59Z').to.be.iso8601('lte', '2000-01-01T00:00:00Z', 500);\n```\n\nIf you are using a margin of error in your tests, you might want to make it **mandatory**\nso that it throws an error if you forget to specify one.\n\n```js\nconst chai = require('chai');\n\n// Note the extra call (chai-iso8601 returns a factory function).\nchai.use(require('chai-iso8601')({\n  marginRequired: true\n}));\n\n// Error thrown! 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