This is the Calendar 21 icon for Windows 10. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.
This is an icon for a square shaped calendar. At the top of the calendar are two rings where each page of the calendar would flip over to the back of the pages. On the calendar is a large '21' for the day meaning that this is not a monthly calendar, but a daily calendar.