It would be great to be able to specify not only the end time of the timer, but also the start time, which is different from the current moment.
In my case, it is important to be able to specify a start time that has already passed, for example, the beginning of a week, month or season.
This is useful if, after restarting the computer, I want to resume timing without losing progress.

For example, when half of the month is already over, I don’t want a restart. I want to see how the whole month is divided into two parts: the past and the remaining.