macOS timelineEdit

Release dates

• Mac OS X Public Beta: 13 September 2000
• Mac OS X 10.0: Cheetah, released 24 March 2001 (192 days after the Public Beta)
• Mac OS X 10.1: Puma, released 24 September 2001 (184 days after Cheetah)
• Mac OS X 10.2: Jaguar, released 23 August 2002 (333 days after Puma)
• Mac OS X 10.3: Panther, released 24 October 2003 (427 days after Jaguar)
• Mac OS X 10.4: Tiger, released 29 April 2005 (553 days after Panther)
  • Mac OS X 10.4.4: Tiger for x86 processors, released 10 January 2006 (256 days after the original Tiger release for PowerPC processors)
• Mac OS X 10.5: Leopard, released 26 October 2007 (910 days after Tiger)
• Mac OS X 10.6: Snow Leopard, released 28 August 2009 (672 days after Leopard)
• Mac OS X 10.7: Lion, released 20 July 2011 (691 days after Snow Leopard)
• OS X 10.8: Mountain Lion, released 25 July 2012 (371 days after Lion)
• OS X 10.9: Mavericks, released 22 October 2013 (454 days after Mountain Lion)
• OS X 10.10: Yosemite, released 16 October 2014 (359 days after Mavericks)
• OS X 10.11: El Capitan, released 30 September 2015 (349 days after Yosemite)
• macOS 10.12: Sierra, released 20 September 2016 (356 days after El Capitan).
• macOS 10.13: High Sierra, released 26 September 2017 (370 days after Sierra).
• macOS 10.14: Mojave, released 24 September 2018 (363 days after High Sierra).
• macOS 10.15: Catalina, released 7 October 2019 (378 days after Mojave).
• macOS 11.0 ([10.16]): Big Sur, released 12 November 2020 (402 days after Catalina).
• macOS 12.0: Monterey, released 25 October 2021 (347 days after Big Sur).
• macOS 13.0: Ventura, released 24 October 2022 (364 days after Monterey).
• macOS 14.0: Sonoma, released 26 September 2023 (337 days after Ventura).

The date calculations above were done with Ruby:

$ ruby -r date -e 'puts (Date.new(2022, 10, 24) - Date.new(2021, 10, 25)).to_i'