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-rw-r--r--js/src/tests/non262/Date/reset-time-zone-cache-same-offset.js30
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diff --git a/js/src/tests/non262/Date/reset-time-zone-cache-same-offset.js b/js/src/tests/non262/Date/reset-time-zone-cache-same-offset.js
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index 0000000000..56c9fc262c
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+++ b/js/src/tests/non262/Date/reset-time-zone-cache-same-offset.js
@@ -0,0 +1,30 @@
+// |reftest| skip-if(xulRuntime.OS=="WINNT") -- Windows doesn't accept IANA names for the TZ env variable
+
+const testCases = [
+ {
+ timeZone: "Europe/London",
+ string: "Tue Aug 14 2018 00:00:00 GMT+0100 (BST)",
+ alternativeTimeZones: ["British Summer Time"],
+ localeString: "8/14/2018, 12:00:00 AM GMT+1",
+ },
+ {
+ timeZone: "UTC",
+ string: "Tue Aug 14 2018 00:00:00 GMT+0000 (UTC)",
+ alternativeTimeZones: ["Coordinated Universal Time"],
+ localeString: "8/14/2018, 12:00:00 AM UTC",
+ },
+];
+
+// Repeat twice to test both transitions (Europe/London -> UTC and UTC -> Europe/London).
+for (let i = 0; i < 2; ++i) {
+ for (let {timeZone, string, localeString, alternativeTimeZones} of testCases) {
+ setTimeZone(timeZone);
+
+ let dt = new Date(2018, 8 - 1, 14);
+ assertDateTime(dt, string, ...alternativeTimeZones);
+ assertEq(dt.toLocaleString("en-US", {timeZoneName: "short"}), localeString);
+ }
+}
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);