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cronnode-schedule

What's the difference between ' * ' and ' ? '?

The title already explains what my problem is...

I tried some Cron generators online and they either use '*' or '?' for an expressions to be used with 'node-schedule'.

I'm trying to run a CronJob at 2am everyday, so 0 0 2 ? * * and 0 0 2 * * * both mean the same thing?

Would 0 0 2 ? ? ? also have the same meaning as the two examples above?

I am really confused and I'd appreciate some clarification on this.

Solution

  • Actually, no, ? is allowed only for day in week and day in month. (As second and fourth character in * ? * ? * *)

    For example, you want to run task every 10th in month, but don't care which day it is...

    More on http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.html