Try importing this widget that I’ve attached](Microwave.uasset.zip (57.6 KB)), into your project so you can see how I did it. I used 4.16 but it might work with newer and older versions.
Alternatively:
**Event Graph: **Microwave1 posted by anonymous | blueprintUE | PasteBin For Unreal Engine
IncrementTime Function: IncrementTime posted by anonymous | blueprintUE | PasteBin For Unreal Engine
CheckTimerFinished Function: CheckTimerFinished posted by anonymous | blueprintUE | PasteBin For Unreal Engine [HR][/HR]
Inside my UMG Widget itself I have 10 buttons, called 0-9 respectively, I have a button for Start which starts the timer going and I have 4 text boxes called ‘A’ ‘B’ ‘C’ ‘D’, where A is the left most number in the clock (‘0’0:00) and D is the right most number in the clock (00:0’****0’).
Let me know if you want screenshots or anything else, hope this helps! 