Cron Schedule like 0 58/30 6,7,8,9,10,11,12,13,14,15,16,17 ? * MON,TUE,WED,THU,FRI * does not work

[saberw]

when we use this cron schedule: 0 58/30 6,7,8,9,10,11,12,13,14,15,16,17 ? * MON,TUE,WED,THU,FRI *

so far only the 58th minute will run, but not the 28th minute (30minutes after 58th minute). Is there some kind of bug in the cron scheduler?

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