Block unblock not working properly


I am facing problem we set the block and unblock in the DHTML calendar
First i am setting the block the calander accoring to the weekday id like as

//blocks events from 0 till 8 hours for each Wednesday
//BUT only for the items with id=1, id=4 in the Units view
scheduler.blockTime(3, [0,8*60], { unit: [1,4] });

But when i am trying to Unblock with the weekday id its working fine like as
scheduler.unblockTime(3, [0,8*60], { unit: [1,4] });

but when i am trying to unblock at the particular day its not working.

days: new Date(2016,10,10),
zone: [0,8*60]

Please suggest me .

Thanks and Regards