To add a timer widget, simply drag and drop it from this icon into an existing container.
You can then determine the title of the timer as well as write additional information about it. After that you can set the duration for the timer in hours and minutes or schedule the timer for a certain time and date in the future. The scheduling method effectively creates a 'countdown' to the chosen time and day.
You can also write a customized message that will be shown to the user once the time has run out.
This is how the timer will appear for once all of the details are set.