Different types of Cron Expression

Question

I am a little confused about the Cron expression used in the unix system and the one Java Quartz is used. The left-most entry of standard cron expression used by Unix represents "minute". But the cron expression used by Quartz uses the left most entry to represent "second": http://quartz-scheduler.org/documentation/quartz-1.x/tutorials/crontrigger I want to know how many versions of cron expression are currently being used? What happens if I pass the standard version of cron into Quartz? Thanks a lot

Accepted Answer

I don't know how much versions of Cron expression exist but the most famous one is indeed the Unix one.

If you want to translate a Unix Cron expression to a Quartz Cron expression consider this.

Quartz format is :

```
(second, minute, hour, day_of_month, month, day_of_week, year)
```

Unix format is :

```
        (minute, hour, day_of_month, month, day_of_week, task)
```

So if you to translate a Unix cron into Quartz, you just have to add a value for the `second` and `year`.

If you want the same cron, you use 0 for `second` and `*` for `year`

Different types of Cron Expression

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