fnmain(){let date =std::process::Command::new("date").args(["-u","+%Y%m%d"]).output().ok().filter(|o|o.status.success()).and_then(|o|String::from_utf8(o.stdout).ok()).map(|s|s.trim().to_string()).unwrap_or_else(||"unknown".to_string());println!("cargo:rustc-env=BUILD_DATE={date}");}