diff --git a/core/libs/prx/libc/src/Time.cpp b/core/libs/prx/libc/src/Time.cpp
index 189bde0aa502..a50cce43e6c5 100644
--- a/core/libs/prx/libc/src/Time.cpp
+++ b/core/libs/prx/libc/src/Time.cpp
@@ -275,8 +275,10 @@ void addNumber(FormatBuffer& buffer, std::int64_t value, int modulus, const char
 }
 
 const char* tableName(int index, const char* const* names, const char* const* shortNames, int count) {
-    if (index < 0) return shortNames[0];
-    return index < count ? names[index] : "";
+    const auto field = static_cast<std::int32_t>(static_cast<std::uint32_t>(index) * 2u + (names == shortNames ? 0u : 1u));
+    if (field < 0) return shortNames[0];
+    if (field >= 2 * count) return "";
+    return field % 2 == 0 ? shortNames[field / 2] : names[field / 2];
 }
 
 int twoDigitYear(std::int64_t year) {
diff --git a/core/libs/tests/GuestStrftime.cpp b/core/libs/tests/GuestStrftime.cpp
index c7a55368ece1..cbe6d8d5956e 100644
--- a/core/libs/tests/GuestStrftime.cpp
+++ b/core/libs/tests/GuestStrftime.cpp
@@ -82,6 +82,23 @@ int main() {
         Check(name, time, "%a|%A|%b|%B|%m|%u|%w", expected[value + 3]);
     }
 
+    struct WrappedName {
+        int value;
+        const char* expected;
+    };
+    constexpr WrappedName wrapped[] = {
+        {-2147483647 - 1, "Sun|Sunday|Jan|January"}, {-1884104312, "|||"}, {-1073741825, "|||"}, {-1073741824, "Sun|Sun|Jan|Jan"},
+        {536870912, "|||"}, {1073741823, "|||"}, {1073741824, "Sun|Sun|Jan|Jan"}, {1526330116, "Sun|Sun|Jan|Jan"}, {2147483647, "Sun|Sun|Jan|Jan"},
+    };
+    for (const auto& item : wrapped) {
+        GuestTm time = base;
+        time.tm_wday = item.value;
+        time.tm_mon = item.value;
+        char name[32];
+        std::snprintf(name, sizeof(name), "wrapped index %d", item.value);
+        Check(name, time, "%a|%A|%b|%B", item.expected);
+    }
+
     struct Field {
         int value;
         const char* expected;
@@ -254,6 +271,13 @@ int main() {
     past.tm_wday = 7;
     past.tm_mon = 12;
     CheckAsctime("names past the tables", past, "   2 13:05:09 2026\n");
+    GuestTm wrappedNames = base;
+    wrappedNames.tm_wday = 1073741824;
+    wrappedNames.tm_mon = -1073741825;
+    CheckAsctime("wrapped names", wrappedNames, "Sun   2 13:05:09 2026\n");
+    wrappedNames.tm_wday = -1073741825;
+    wrappedNames.tm_mon = -2147483647 - 1;
+    CheckAsctime("wrapped names from INT_MIN", wrappedNames, " Jan  2 13:05:09 2026\n");
     GuestTm big = base;
     big.tm_mday = 40;
     big.tm_hour = 25;