Could this be the world's oldest pocket calendar? Engraved tusk would have told farmers when to harvest crops up to 8,000 years ago

Could this be the world's oldest pocket calendar? Engraved tusk would have told farmers when to harvest crops up to 8,000 years ago | Mail Online: "It may look like a banana, but this curved device is actually thought to be the world's oldest pocket calendar. Archaeologists found the calendar in Serbia and believe the moon-shaped device is around 8,000 years old."