1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/DateTimeFormat/tz-environment-variable.js b/js/src/tests/non262/Intl/DateTimeFormat/tz-environment-variable.js
new file mode 100644
index 0000000000..6128abb9d1
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+++ b/js/src/tests/non262/Intl/DateTimeFormat/tz-environment-variable.js
@@ -0,0 +1,67 @@
+// |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");