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diff --git a/js/src/tests/non262/Intl/DateTimeFormat/tz-environment-variable.js b/js/src/tests/non262/Intl/DateTimeFormat/tz-environment-variable.js
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+++ b/js/src/tests/non262/Intl/DateTimeFormat/tz-environment-variable.js
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+// |reftest| skip-if(!this.hasOwnProperty("Intl")||(xulRuntime.OS=="WINNT"&&!xulRuntime.shell)) -- Windows browser in automation doesn't pick up new time zones correctly
+
+// From bug 1330149:
+//
+// Windows only supports a very limited set of IANA time zone names for the TZ
+// environment variable.
+//
+// TZ format supported by Windows: "TZ=tzn[+|-]hh[:mm[:ss]][dzn]".
+//
+// Complete list of all IANA time zone ids matching that format.
+//
+// From tzdata's "northamerica" file:
+// EST5EDT
+// CST6CDT
+// MST7MDT
+// PST8PDT
+//
+// From tzdata's "backward" file:
+// GMT+0
+// GMT-0
+// GMT0
+//
+// Also supported on Windows even though they don't match the format listed
+// above.
+//
+// From tzdata's "backward" file:
+// UCT
+// UTC
+//
+// From tzdata's "etcetera" file:
+// GMT
+
+function inTimeZone(tzname, fn) {
+ setTimeZone(tzname);
+ try {
+ fn();
+ } finally {
+ setTimeZone("PST8PDT");
+ }
+}
+
+const timeZones = [
+ { id: "EST5EDT" },
+ { id: "CST6CDT" },
+ { id: "MST7MDT" },
+ { id: "PST8PDT" },
+ // ICU on non-Windows platforms doesn't accept these three time zone
+ // identifiers, cf. isValidOlsonID in $ICU/source/common/putil.cpp. We
+ // could add support for them, but it seems unlikely they're used in
+ // practice, so we just skip over them.
+ // { id: "GMT+0", normalized: "UTC" },
+ // { id: "GMT-0", normalized: "UTC" },
+ // { id: "GMT0", normalized: "UTC" },
+ { id: "UCT", normalized: "UTC" },
+ { id: "UTC", normalized: "UTC" },
+ { id: "GMT", normalized: "UTC" },
+];
+
+for (let {id, normalized = id} of timeZones) {
+ inTimeZone(id, () => {
+ let opts = new Intl.DateTimeFormat().resolvedOptions();
+ assertEq(opts.timeZone, normalized);
+ });
+}
+
+if (typeof reportCompare === "function")
+ reportCompare(0, 0, "ok");