cron-converter

Cron string parser for node and the browser

Try the online demo and check the source code for the integration.

yarn add cron-converter

or

npm install cron-converter --save

Versions 2.x.x of cron-converter are not backwards compatible with versions 1.x.x.
| | 2.x.x | 1.x.x | | ---- | ------------- | ------------- | | API | Functional | Object-oriented | | Loader | ESM and CommonJS | CommonJS only | | Type definitions | Bundled | Install @types/cron-converter | | Date/time | Luxon | Moment.js | | Tree-shaking | ✅ | ❌ |

import { stringToArray, arrayToString, getSchedule, getUnits } from "cron-converter";

Convert a string to an array

// Every 10 mins between 9am and 5pm on the 1st of every month
const arr = stringToArray("*/10 9-17 1 * *");

// Prints:
// [
//   [ 0, 10, 20, 30, 40, 50 ],
//   [ 9, 10, 11, 12, 13, 14, 15, 16, 17 ],
//   [ 1 ],
//   [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ],
//   [ 0, 1, 2, 3, 4, 5, 6 ]
// ]
console.log(arr);

Convert an array to a string

const str = arrayToString([[0], [1], [1], [5], [0, 2, 4, 6]]);

// Prints: '0 1 1 5 */2'
console.log(str);

Formatting options

outputMonthNames

Default: false

const arr = [[1], [1], [1], [1, 2, 3], [1, 2, 3]];
const str = arrayToString(arr, { outputMonthNames: true });

// Prints: '1 1 1 JAN-MAR 1-3'
console.log(str);

outputWeekdayNames

Default: false

const arr = [[1], [1], [1], [1, 2, 3], [1, 2, 3]];
const str = arrayToString(arr, { outputWeekdayNames: true });

// Prints: '1 1 1 1-3 MON-WED'
console.log(str);

outputHashes

Default: false

const arr = [[1], [1], [1], [1, 6, 11], [0, 1, 2, 3, 4, 5, 6]];

// Prints: '1 1 1 H/5 H'
console.log(arrayToString(arr, { outputHashes: true }));

Get the schedule execution times

// Convert a string to an array
const arr = stringToArray("*/5 * * * *");

// Get the iterator, initialised to now
let schedule = getSchedule(arr);

// Optionally pass a reference `Date` and a `timezone`
let reference = new Date(2013, 2, 8, 9, 32);
schedule = getSchedule(arr, reference, "Europe/London");

// Calls to `.next()` and `.prev()` return a Luxon `DateTime` object

// Prints: '2013-03-08T09:35:00+00:00''
console.log(schedule.next().format());
// Prints: '2013-03-08T09:40:00+00:00''
console.log(schedule.next().format());

// Reset
schedule.reset();

// Prints: '2013-03-08T09:30:00+00:00''
console.log(schedule.prev().format());
// Prints: '2013-03-08T09:25:00+00:00''
console.log(schedule.prev().format());

Get the units configuration

This is useful if you are creating a user interface. See units.ts.

const units = getUnits();

Test and build

git clone https://github.com/roccivic/cron-converter
cd cron-converter
yarn
yarn build
yarn test
yarn coverage