Nadgodziny and other 86,400 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
This is an icon for representing overtime. There is a calendar with boxes on it depicting the days of the week. There is a clock over the top-left portion of the calendar with the hands showing 4:00. The circle portion of the clock is an arrow going clockwise around the face.