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Quartz.Net - Every 3 Months

I try to call something every 3 months (quarterly) in Quartz.NET (using both stable and latest version 2, which is a beta version with the same results).

I create a cron trigger 0 30 8 3 */3 ? *, which is called every 3 months at 8:30 in the third month of the month when it occurs.

So technically, from September 2, today I expect this to call tomorrow. However, next time it will be shown next month. Why is this so?

Updated: In accordance with the answers I received, I created the following method - it may be useful for someone:

public static string CalculateMonthsWithInterval(int startMonth, int interval)
        {
            var months = new List<string>();
            var monthNames = new [] {"JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"};

            var monthSelector = startMonth % interval;

            for (var i = 0; i < 12; i++)
            {
                if (i % interval == monthSelector)
                {
                    months.Add(monthNames[i]);
                }
            }

            return string.Join(",", months.ToArray());
        }

Ps: I have not used indexes for several months because for some reason it did not work with my quartz (v2 BETA). It is also easier to read at the database level.

- 3 startDate:

var cronMonths = CronUtils.CalculateMonthsWithInterval((startDate.Month - 1), 3);
+5
2

, , , 3, Quartz 0 (: http://www.quartz-scheduler.org/documentation/quartz-2.x/tutorials/tutorial-lesson-06), , , , , .

0 mod 3 = 0 -> JAN
1 mod 3 = 1 -> FEB
...
8 mod 3 = 2 -> SEP
9 mod 3 = 0 -> OCT

Quartz cron , 3 0.

, 1 (, , ), :

0 30 8 3 MAR,JUN,SEP,DEC ? *

+8

cron: http://www.cronmaker.com/

Cron:

0 0 12 1 1/3 ? *

:

1. Saturday, April 1, 2017 12:00 PM
2.  Saturday, July 1, 2017 12:00 PM
3.  Sunday, October 1, 2017 12:00 PM
4.  Monday, January 1, 2018 12:00 PM
5.  Sunday, April 1, 2018 12:00 PM
+5

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