date: apply locale name substitution before GNU modifier processing

src/uu/date/src/date.rs

@@ -708,24 +708,25 @@ fn format_date_with_locale_aware_months(
     config: &Config<PosixCustom>,
     skip_localization: bool,
 ) -> Result<String, String> {
-    // First check if format string has GNU modifiers (width/flags) and format if present
-    // This optimization combines detection and formatting in a single pass
-    if let Some(result) =
-        format_modifiers::format_with_modifiers_if_present(date, format_string, config)
-    {
+    // Apply locale-aware name substitution (month/day names) before modifier
+    // processing, so that formats like "%-e" don't bypass localization of "%b"/"%A".
+    let localized;
+    let fmt = if !skip_localization && should_use_icu_locale() {
+        localized = localize_format_string(format_string, date.date());
+        &localized
+    } else {
+        format_string
+    };
+
+    // Check if format string has GNU modifiers (width/flags) and format if present
+    if let Some(result) = format_modifiers::format_with_modifiers_if_present(date, fmt, config) {
         return result.map_err(|e| e.to_string());
     }
 
     let broken_down = BrokenDownTime::from(date);
-
-    let result = if !should_use_icu_locale() || skip_localization {
-        broken_down.to_string_with_config(config, format_string)
-    } else {
-        let fmt = localize_format_string(format_string, date.date());
-        broken_down.to_string_with_config(config, &fmt)
-    };
-
-    result.map_err(|e| e.to_string())
+    broken_down
+        .to_string_with_config(config, fmt)
+        .map_err(|e| e.to_string())
 }
 
 /// Return the appropriate format string for the given settings.

tests/by-util/test_date.rs

@@ -1619,6 +1619,45 @@
     }
 }
 
+#[test]
+fn test_date_locale_hu_hungarian() {
+    // Test Hungarian locale (hu_HU.UTF-8) behavior
+    // Hungarian typically uses 24-hour format and may have localized day/month names
+
+    let result = new_ucmd!()
+        .env("LC_ALL", "hu_HU.UTF-8")
+        .env("TZ", "UTC")
+        .arg("-d")
+        .arg("2025-12-14T13:00:00")
+        .succeeds();
+
+    let stdout = result.stdout_str();
+
+    // Hungarian locale should use 24-hour format (no AM/PM)
+    assert!(
+        !stdout.contains("AM") && !stdout.contains("PM"),
+        "Hungarian locale should use 24-hour format (no AM/PM), got: {stdout}"
+    );
+
+    // Should have 13:00 (not 1:00)
+    assert!(
+        stdout.contains("13:00"),
+        "Hungarian locale should show 13:00 for 1 PM, got: {stdout}"
+    );
+
+    // Timezone should be included (our implementation adds %Z if missing)
+    assert!(
+        stdout.contains("UTC") || stdout.contains("+00") || stdout.contains('Z'),
+        "Output should include timezone information, got: {stdout}"
+    );
+
+    // Check proper formatting (no double dots, day name, etc.) of entire output
+    assert!(
+        stdout == "2025. dec. 14., vasárnap, 13:00:00 UTC\n",
+        "Incorrect Hungarian output format, got: {stdout}"
+    );
+}
+
 #[test]
 #[cfg(any(target_os = "linux", target_os = "android", target_vendor = "apple"))]
 fn test_date_locale_fr_french() {
@@ -2149,6 +2188,7 @@
         ("es_ES.UTF-8", "enero", "junio", "diciembre"),
         ("it_IT.UTF-8", "gennaio", "giugno", "dicembre"),
         ("pt_BR.UTF-8", "janeiro", "junho", "dezembro"),
+        ("hu_HU.UTF-8", "január", "június", "december"),
         ("ja_JP.UTF-8", "1月", "6月", "12月"),
         ("zh_CN.UTF-8", "一月", "六月", "十二月"),
     ] {