Issue #21205 has been reported by BertramScharpf (Bertram Scharpf). ---------------------------------------- Bug #21205: File::Stat#birthtime is available on Linux https://bugs.ruby-lang.org/issues/21205 * Author: BertramScharpf (Bertram Scharpf) * Status: Open * ruby -v: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Not that I would run into any problem with it, but this behaviour is confusing: RbConfig::CONFIG["platform"] #=> "amd64-freebsd14" (File.birthtime "/").class #=> Time (File.stat "/").birthtime.class #=> Time RbConfig::CONFIG["platform"] #=> "x86_64-linux" (File.birthtime "/").class #=> Time (File.stat "/").birthtime # raises NotImplementedError -- https://bugs.ruby-lang.org/