Support AIX operating system

src/lib.rs

@@ -38,6 +38,7 @@
     path = "tz_illumos.rs"
 )]
 #[cfg_attr(target_os = "android", path = "tz_android.rs")]
+#[cfg_attr(target_os = "aix", path = "tz_aix.rs")]
 mod platform;
 
 /// Error types

src/platform.rs

@@ -5,5 +5,5 @@ pub fn get_timezone_inner() -> std::result::Result<String, crate::GetTimezoneErr
 #[cfg(not(feature = "fallback"))]
 compile_error!(
     "iana-time-zone is currently implemented for Linux, Window, MacOS, FreeBSD, NetBSD, \
-    OpenBSD, Dragonfly, WebAssembly (browser), iOS, Illumos, Android, and Solaris.",
+    OpenBSD, Dragonfly, WebAssembly (browser), iOS, Illumos, Android, AIX and Solaris.",
 );

src/tz_aix.rs

@@ -0,0 +1,5 @@
+use std::env;
+
+pub(crate) fn get_timezone_inner() -> Result<String, crate::GetTimezoneError> {
+    env::var("TZ").map_err(|_| crate::GetTimezoneError::OsError)
+}