Quartz cron expression for cron triggers runs every Nth hour / day / week / month

Question

I am developing an application that gives the user the ability to plan some actions. User provided inputs

• N value
• Option between hours / day / week / month
• the date of the beginning
• Start time

I cannot get cron expressions for each type of repeat interval ie Hour / Day / Week / Month so that the start time is calculated from the start date.

Answer 1

Quartz documentation suggests using SimpleTrigger http://www.quartz-scheduler.org/docs/cookbook/BiDailyTrigger.html , an example for any other day:

Trigger trigger = new SimpleTrigger("trigger1", "group1");
trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
// 24 hours * 60(minutes per hour) * 60(seconds per minute) * 1000(milliseconds per second)
trigger.setRepeatInterval(2L * 24L * 60L * 60L * 1000L);

, .

Answer 2

, :

http://www.opensymphony.com/quartz/wikidocs/CronTriggers%20Tutorial.html