diff --git a/runtime/vm/os_win.cc b/runtime/vm/os_win.cc
index 9daec00e6f3c..9e5ea5519aaa 100644
--- a/runtime/vm/os_win.cc
+++ b/runtime/vm/os_win.cc
@@ -112,13 +112,11 @@ const char* OS::GetTimeZoneName(int64_t seconds_since_epoch) {
   }
 
   // Figure out whether we're in standard or daylight.
-  bool daylight_savings = (status == TIME_ZONE_ID_DAYLIGHT);
-  if (status == TIME_ZONE_ID_UNKNOWN) {
-    tm local_time;
-    if (LocalTime(seconds_since_epoch, &local_time)) {
-      daylight_savings = (local_time.tm_isdst == 1);
-    }
+  tm local_time;
+  if (!LocalTime(seconds_since_epoch, &local_time)) {
+    return "";
   }
+  const bool daylight_savings = (local_time.tm_isdst == 1);
 
   // Convert the wchar string to a null-terminated utf8 string.
   wchar_t* wchar_name = daylight_savings ? zone_information.DaylightName
diff --git a/tests/corelib/date_time7_test.dart b/tests/corelib/date_time7_test.dart
index f59236a040ce..41f8a941c795 100644
--- a/tests/corelib/date_time7_test.dart
+++ b/tests/corelib/date_time7_test.dart
@@ -21,6 +21,8 @@ testLocal() {
     //
     // Hardcode some common timezones, in both their abbreviated and expanded
     // forms to account for differences between host platforms.
+    print(name);
+    print(offset);
     switch (name) {
       case "CET" || "Central European Time" || "Central European Standard Time":
         Expect.equals(1, offset.inHours);
@@ -34,6 +36,8 @@ testLocal() {
         Expect.equals(-4, offset.inHours);
       case "PDT" || "Pacific Daylight Time":
         Expect.equals(-7, offset.inHours);
+      case "PST" || "Pacific Standard Time":
+        Expect.equals(-8, offset.inHours);
       case "CST" || "Central Standard Time":
         Expect.equals(-6, offset.inHours);
       case "CDT" || "Central Daylight Time":