--- old/src/java.base/share/classes/java/time/zone/ZoneRules.java	2020-03-02 10:34:02.000000000 -0800
+++ new/src/java.base/share/classes/java/time/zone/ZoneRules.java	2020-03-02 10:34:02.000000000 -0800
@@ -470,7 +470,7 @@
      * @return true if the time-zone is fixed and the offset never changes
      */
     public boolean isFixedOffset() {
-        return savingsInstantTransitions.length == 0;
+        return standardTransitions.length == 0 && savingsInstantTransitions.length == 0;
     }
 
     /**
@@ -485,12 +485,13 @@
      * @return the offset, not null
      */
     public ZoneOffset getOffset(Instant instant) {
-        if (savingsInstantTransitions.length == 0) {
+        if (isFixedOffset()) {
             return standardOffsets[0];
         }
         long epochSec = instant.getEpochSecond();
         // check if using last rules
         if (lastRules.length > 0 &&
+                savingsInstantTransitions.length > 0 &&
                 epochSec > savingsInstantTransitions[savingsInstantTransitions.length - 1]) {
             int year = findYear(epochSec, wallOffsets[wallOffsets.length - 1]);
             ZoneOffsetTransition[] transArray = findTransitionArray(year);
@@ -640,11 +641,12 @@
     }
 
     private Object getOffsetInfo(LocalDateTime dt) {
-        if (savingsInstantTransitions.length == 0) {
+        if (isFixedOffset()) {
             return standardOffsets[0];
         }
         // check if using last rules
         if (lastRules.length > 0 &&
+                savingsInstantTransitions.length > 0 &&
                 dt.isAfter(savingsLocalTransitions[savingsLocalTransitions.length - 1])) {
             ZoneOffsetTransition[] transArray = findTransitionArray(dt.getYear());
             Object info = null;
@@ -756,7 +758,7 @@
      * @return the standard offset, not null
      */
     public ZoneOffset getStandardOffset(Instant instant) {
-        if (savingsInstantTransitions.length == 0) {
+        if (isFixedOffset()) {
             return standardOffsets[0];
         }
         long epochSec = instant.getEpochSecond();
@@ -786,7 +788,7 @@
      * @return the difference between the standard and actual offset, not null
      */
     public Duration getDaylightSavings(Instant instant) {
-        if (savingsInstantTransitions.length == 0) {
+        if (isFixedOffset()) {
             return Duration.ZERO;
         }
         ZoneOffset standardOffset = getStandardOffset(instant);