The Spiral Calendar emoji is a picture of a Calendar, the sheets of which are meant to have one date and fixed together with a special spiral (like in the item represented by Spiral Notepad emoji).
The spiral calendar emoji was introduced in 2014 and released as part of the Unicode 11.0 standard. This emoji can be found under the objects
category. Because the spiral calendar emoji has been around for quite some time, it should display correctly in the majority of operating systems.