@Björn Eiacute;ksson I am not sure what you are asking you get notify in the event when the value changes and you there notify the rest of your application and variables of the change.
If you for any reason want to read the value at random time then you just read the controls DateValue property.
Basically same as any other control works
Unfortunately i can not show any example code TimeCtrl and DateCtrl (plugin) are not exported with the project.
I give an example :
I wrote Method to draw analogical clock, i want to move the needles shows.
when i modify "hour or minutes" the needles shows must move imidiately ... , it means that the time inside my draw method changes when increasing or decreasing the hours or minutes in the Time Picker (TimeCtrl).