Reference Time is located on the top-left area of main view. It brings you two kinds additional time info and you can select one of them.
1st one is how much time has passed from your last focus, which is so called ‘Break Time Mode’. 2nd is how much time remains for the rest of the day, which is so called ‘Remaining Time Mode’
It show how much time has passed from your last focus. So it’s counting up from 1 second as below.
It show how much left for the rest of the day. The end time of the day doesn’t need to be 24:00 and you can set it from 20:00 ~ 04:00 through Setting > Remaining Time Till.