title: asp.net cron job quartz.net bug, not firing always
body: <p>I have a job, which triggers in every 30 minutes. I've set a test table and record information, when job fires. For example :</p>
  
  <pre><code>2015-12-13 19:30:00.043
  2015-12-14 12:30:00.043
  2015-12-14 13:00:00.043
  2015-12-14 16:00:00.043
  </code></pre>
  
  <p>But as you can see it does not trigger in  every 30 minutes. 19:30 then 12:30..  I've noticed that if i open managament studio and check this table, next job would trigger 100%. Why is that happening, is it quartz.net bug? 
  P.S i am using asp.net mvc and this is code :</p>
  
  <pre><code>  ITrigger trigger = TriggerBuilder.Create()
                     .WithDailyTimeIntervalSchedule
                       (s =&gt;
                          s.WithIntervalInMinutes(30)
                          .OnEveryDay()
                         .StartingDailyAt(TimeOfDay.HourAndMinuteOfDay(0, 0))
                       )
                     .Build();
  
                 scheduler.ScheduleJob(job, trigger);
  </code></pre>