I did not know that there was in-game clock. To toggle it, simply click the clock icon above the level marker in the middle of the UI.
Also, you can move the active quests icon. To do this, right click on the key symbol beside it (the one you would use to hide the quests) and drag anywhere on the screen.
one of those little sneaky hidden things that only takes a thousand hours to uncover 
like portaling directly from the world map, usually takes 300 or so hours to find 
on the quest note, if someone has amassed 100 quests and the quest tracker goes off the screen, can go inside the quest log and click quests off to not show them on the UI
or can click the quest tracker icon to just totally hide all active tracked quests from teh screen 
and clicking the gold chevron right of the mana bar can enlarge or hide the minimap
The one that really got me was using personal rifts. Say for a shrine in Broken Hills, before I would go to DC and craft the item and then proceed to walk ALL the way back to the shrine from the Broken Hills rift. It made me so happy when I figured out to use the personal rifts. Only took like ~400hrs to get that one.
Best with a macro that does
for you with one button press.
You can also just hover over it to see what time it is without toggling it. 
I figured that one when playing a skater build when I dragged that window by mistake 
Yeah I was playing grey’s Blitz Warlord at the time and accidentally came across it.
