diff --git a/stl/src/tzdb.cpp b/stl/src/tzdb.cpp
index 511951451b7..bad8b2f1ae2 100644
--- a/stl/src/tzdb.cpp
+++ b/stl/src/tzdb.cpp
@@ -30,7 +30,6 @@ namespace {
         _STD atomic<decltype(&::ucal_getTimeZoneDisplayName)> _Pfn_ucal_getTimeZoneDisplayName{nullptr};
         _STD atomic<decltype(&::ucal_getTimeZoneTransitionDate)> _Pfn_ucal_getTimeZoneTransitionDate{nullptr};
         _STD atomic<decltype(&::ucal_getTZDataVersion)> _Pfn_ucal_getTZDataVersion{nullptr};
-        _STD atomic<decltype(&::ucal_inDaylightTime)> _Pfn_ucal_inDaylightTime{nullptr};
         _STD atomic<decltype(&::ucal_open)> _Pfn_ucal_open{nullptr};
         _STD atomic<decltype(&::ucal_openTimeZoneIDEnumeration)> _Pfn_ucal_openTimeZoneIDEnumeration{nullptr};
         _STD atomic<decltype(&::ucal_setMillis)> _Pfn_ucal_setMillis{nullptr};
@@ -78,7 +77,6 @@ namespace {
             _Load_address(_Icu_module, _Icu_functions._Pfn_ucal_getTimeZoneTransitionDate,
                 "ucal_getTimeZoneTransitionDate", _Last_error);
             _Load_address(_Icu_module, _Icu_functions._Pfn_ucal_getTZDataVersion, "ucal_getTZDataVersion", _Last_error);
-            _Load_address(_Icu_module, _Icu_functions._Pfn_ucal_inDaylightTime, "ucal_inDaylightTime", _Last_error);
             _Load_address(_Icu_module, _Icu_functions._Pfn_ucal_open, "ucal_open", _Last_error);
             _Load_address(_Icu_module, _Icu_functions._Pfn_ucal_openTimeZoneIDEnumeration,
                 "ucal_openTimeZoneIDEnumeration", _Last_error);
@@ -146,11 +144,6 @@ namespace {
         return _Fun(status);
     }
 
-    [[nodiscard]] UBool __icu_ucal_inDaylightTime(const UCalendar* cal, UErrorCode* status) noexcept {
-        const auto _Fun = _Icu_functions._Pfn_ucal_inDaylightTime.load(_STD memory_order_relaxed);
-        return _Fun(cal, status);
-    }
-
     [[nodiscard]] UCalendar* __icu_ucal_open(
         const UChar* zoneID, int32_t len, const char* locale, UCalendarType type, UErrorCode* status) noexcept {
         const auto _Fun = _Icu_functions._Pfn_ucal_open.load(_STD memory_order_relaxed);
@@ -519,12 +512,7 @@ void __stdcall __std_tzdb_delete_current_zone(__std_tzdb_current_zone_info* cons
         return _Report_error(_Info, __std_tzdb_error::_Icu_error);
     }
 
-    const auto _Is_daylight = __icu_ucal_inDaylightTime(_Cal.get(), &_UErr);
-    if (U_FAILURE(_UErr)) {
-        return _Report_error(_Info, __std_tzdb_error::_Icu_error);
-    }
-
-    _Info->_Save = _Is_daylight ? __icu_ucal_get(_Cal.get(), UCalendarDateFields::UCAL_DST_OFFSET, &_UErr) : 0;
+    _Info->_Save = __icu_ucal_get(_Cal.get(), UCalendarDateFields::UCAL_DST_OFFSET, &_UErr);
     if (U_FAILURE(_UErr)) {
         return _Report_error(_Info, __std_tzdb_error::_Icu_error);
     }
@@ -560,7 +548,7 @@ void __stdcall __std_tzdb_delete_current_zone(__std_tzdb_current_zone_info* cons
     }
 
     int32_t _Abbrev_len{};
-    const auto _Abbrev = _Get_timezone_short_id(_Cal.get(), _Is_daylight, _Abbrev_len, _Info->_Err);
+    const auto _Abbrev = _Get_timezone_short_id(_Cal.get(), _Info->_Save != 0, _Abbrev_len, _Info->_Err);
     if (_Abbrev == nullptr) {
         return _Propagate_error(_Info);
     }
diff --git a/tests/std/tests/P0355R7_calendars_and_time_zones_time_zones/test.cpp b/tests/std/tests/P0355R7_calendars_and_time_zones_time_zones/test.cpp
index fdfa456263b..7af9458b46c 100644
--- a/tests/std/tests/P0355R7_calendars_and_time_zones_time_zones/test.cpp
+++ b/tests/std/tests/P0355R7_calendars_and_time_zones_time_zones/test.cpp
@@ -402,6 +402,31 @@ void timezone_sorted_vectors_test() {
     assert(ranges::is_sorted(my_tzdb.leap_seconds));
 }
 
+void timezone_historical_dst_abolished_test() {
+    // Regression test: timezones that abolished DST must still report
+    // correct historical offsets for dates when DST was active.
+    const auto& my_tzdb = get_tzdb();
+
+    { // America/Sao_Paulo - abolished DST Feb 2019
+        auto tz   = my_tzdb.locate_zone("America/Sao_Paulo");
+        auto info = tz->get_info(sys_days{year{2019} / January / day{1}});
+        assert(info.offset == seconds{-7200});
+        assert(info.save == minutes{60});
+    }
+    { // Europe/Istanbul - abolished DST Sep 2016
+        auto tz   = my_tzdb.locate_zone("Europe/Istanbul");
+        auto info = tz->get_info(sys_days{year{2016} / July / day{1}});
+        assert(info.offset == seconds{10800});
+        assert(info.save == minutes{60});
+    }
+    { // Europe/Moscow - abolished DST Oct 2014
+        auto tz   = my_tzdb.locate_zone("Europe/Moscow");
+        auto info = tz->get_info(sys_days{year{2010} / July / day{1}});
+        assert(info.offset == seconds{14400});
+        assert(info.save == minutes{60});
+    }
+}
+
 void test() {
     timezone_tzdb_list_test();
     timezone_version_test();
@@ -411,6 +436,7 @@ void test() {
     timezone_local_info_test();
     timezone_precision_test();
     timezone_sorted_vectors_test();
+    timezone_historical_dst_abolished_test();
 }
 
 int main() {