spiral calendar

Spiral calendars. Often depicted as monthly calendars with red or blue headers. Apple and Samsung's pages curl up in the bottom right to flip for a new moon. Like Microsoft, Twitter and Facebook's designs feature a generic month. WhatsApp's design features a green header for February, when it was founded in 2009. Apple, Samsung and Joypixels' designs show off July, when World Emoji Day falls on the 17th, a date that Google designed.