I have some interest in constructed alphabets and numeric systems. In line with that, I made my own notation for months and dates. The “alphabet” for months are 12 symbols (3 related symbols, rotated 4 ways) and the “alphabet” for months are 32 symbols (8 related symbols, rotated 4 ways).
Anyone is free to use this system for any purpose. I just came up with it for creative amusement and for a simple way to represent month and day in two simple symbols.