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Does anyone know of any existing solutions using javascript that can parse a crontab and return all datetime instances between a given start and end date?
ie if i have 0 * * * *, start 24/10/2011 16:00 and end 24/10/2011 19:00 then it will return:
24/10/2011 16:00,
24/10/2011 17:00,
24/10/2011 18:00
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*/30 * * * * your_command. this means "run when the minute of each hour is evenly divisible by 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc) example #3. 0,30 * * * * your_command. this means "run when the minute of each hour is 0 or 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc)
Run a Cron Job Every 5 Minutes However, typing the whole list can be tedious and prone to errors. The second option to specify a job to be run every 5 minutes hours is to use the step operator: */5 * * * * command. */5 means create a list of all minutes and run the job for every fifth value from the list.
io's cron expression feature, the designated time zone is UTC. Each field has a set of allowed values, which are the only values that are valid to use for that particular field.
Cron job format A schedule is defined using the unix-cron string format ( * * * * * ) which is a set of five fields in a line, indicating when the job should be executed. You can use either the Google Cloud console, the Google Cloud CLI, or the Cloud Scheduler REST API to set your schedule.
You might want to check out Later.js which can parse a Cron expression and calculate the next occurrences.
var schedule = cronParser().parse('* */5 * * * *', true);
var results = later(60).get(schedule, 100, startDate, endDate);
This isn't much help, but it's a start. There are some java (not javascript) and php solutions that have some decent code that you'd want to translate and incorporate if you end up writing this yourself.
Take a look at these two bits of code:
http://www.redmoon.ch/?p=39
http://www.phpclasses.org/package/2568-PHP-Parse-cron-tab-files-to-retrieve-job-schedules.html
HTH
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