Hide solved check marks (list & task pages) for problems whose last submission is before a selected date.
ของเมื่อวันที่
It clears the checkbox from the UI from the problems which you had solved before a selected date. In this way you can again go through all the problems and easily know which ones are left to do.
Apart from this, it also shows the statistics about [Total number of problems / Correct / Wrong / Unattempted] for every section.
