haha yeah, I made a quick search before posting this thread, and I found a lot of really old calendars:
- Amazigh calendar (began 950 BCE) = 2975
- Hebrew calendar (began 3761 BCE) = 5785
- Assyrian calendar (began 4750 BCE) = 6775
- Egyptian calendar (began ~3100 BCE) = 5125
- Sumerian calendar (began ~3100 BCE) = 5125
- Mayan Long Count calendar (began 3114 BCE) = 5129
- Hindu calendar (Kali Yuga) (began 3102 BCE) = 5127
- Zoroastrian calendar (began ~1737 BCE) = 3762
- Buddhist calendar (began 543 BCE) = 2568
And last but not least:
- Dinosaur calendar ( ~230 million years ago) = 230 002 025
