This utility was built to process AWS Cron Expressions used by Amazon CloudWatch. It can support all the specs listed in the link below, including the special wildcards L W and #.
npm install aws-cron-parserThere are only 3 methods: parse, next, and prev
import awsCronParser from "aws-cron-parser";
// first we need to parse the cron expression
const cron = awsCronParser.parse("9 * 7,9,11 5 ? 2020,2022,2024-2099");
// to get the first occurrence from now
let occurrence = awsCronParser.next(cron, new Date());
// to get the next occurrence following the previous one
occurrence = awsCronParser.next(cron, occurrence);
// and use prev to get the previous occurrence
occurrence = awsCronParser.prev(cron, occurrence);