Cron Expression Parser in PHP

Working with cron scheduling can many times be a frustrating affair. Although setting a few cron jobs at one time can be easy, calculating cron dates in the future in code can get time consuming quickly. The PHP cron expression parser described here can parse a CRON expression, determine if it is due to run, calculate the next run date of the expression or calculate the previous run date of the expression. You can calculate dates far into the future or past by skipping n number of matching dates.
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