This is the Kalendarz 30 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 a calendar page that is displaying the number thirty. There is no month displayed, nor is there a day. There are, however, what looks like two rings protruding from the top of the page, suggesting that this is a calendar that can be adapted for reuse month after month.