getNextRunDate is always returning nil

[cliftonmyers]

Can you tell me what is wrong with this usage? you can try any of the below cronStrings.
And why it is always returning nil

//"30 9 ? * MON,WED,FRI *" //"30 15 ? * TUE,THU *" //"0 10 ? * MON-FRI *" //"30 18 ? * MON-FRI *" //"0 20 ? * * *" let cronString = "0 8 ? * * *" var calendar = Calendar.current calendar.timeZone = NSTimeZone.local let startOfDate = calendar.startOfDay(for: date) let cronExpression = CronExpression(cronString: cronString) if let nextRunDate = cronExpression?.getNextRunDate(startOfDate) { // should go the code to run on "nextRunDate" }

[TheCodedSelf]

Hi @cliftonmyers, the ? operator is not supported, as such 0 8 ? * * * will fail.

Additionally, please use the format specified on the Cron Wikipedia page.

30 9 * * MON,WED,FRI * (note I have removed the ? from your example) should be 30 9 * * 1,3,5 *, which will run at 09:30AM every Monday, Wednesday, and Friday.

[cliftonmyers]

Okay so i will need to do some hacks on the cronExpressions i am receiving in order to be parsed correctly using your library.

What about the operator "/", it is not supported as well right?
what is the alternative to it, if i want to replace it with something that actually works?

[TheCodedSelf]

You'll just need to do some find and replace before creating a CronExpression with the expressions you're receiving. Alternatively feel free to implement the features you'd want, I'd welcome the contribution.

[cliftonmyers]

Actually, i searched many pods parsing crons, but yours was the best, others were beginners.

I thought that it would cover all the formats, but surprisingly it is not.

When i have time i can add support to additional features, but currently i m tight on my deadline, and the "/" will be a blocker for me.

Can you find a way to help implementing it soon, and i promise i will be contributing in the future with making this library better.

[TheCodedSelf]

There is currently a ticket open for the / operator.

I don't have the capacity to work on this myself at present and I'd most likely miss your deadline. What I could do is guide you through the code base and the best way of implementing it. If you're willing to give it a bash, just let me know.

[cliftonmyers]

so basically, you are not using the quartz variation for the cronExpression.

Can you tell me which variation you are using, maybe if i get another response with this variation, it could work better.

[TheCodedSelf]

The library is using the standard format specified on the Cron Wikipedia page.

Implementing the special operators from the Quartz variation is desired, but not yet complete.