Do Not Disturb mode stays on all time even the moon icon appears and the schedule mode being off
The article appears to be wrong. It's the 8th of January, and it still isn't working here.
It worked for me it entered the scheduled Do Not Disturb at 23:30 on the 7th of January.
Try the usual re-start, hole the on off button and the home button.
I tried turning it of and on 3 times and no change. Still stuck in DND if I turn it on. Not only during scheduled times like it is supposed to.
I even wiped my phone and did a complete restore from the cloud and it still gets stuck in DND
Try going into Settings > Notifications > Do Not Disturb > and Set the 'Scheduled' Off and On again.
Retrieving data ...