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diff --git a/js/src/tests/non262/Date/time-zones-posix.js b/js/src/tests/non262/Date/time-zones-posix.js
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+// |reftest| skip-if(xulRuntime.OS=="WINNT"&&!xulRuntime.shell) -- Windows browser in automation doesn't pick up new time zones correctly
+
+// Repeats the test from "time-zones.js", but uses POSIX instead of IANA names
+// for the time zones. This allows to run these tests on Windows, too.
+
+// 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
+
+
+// Perform the following replacements:
+//   America/New_York    -> EST5EDT
+//   America/Chicago     -> CST6CDT
+//   America/Denver      -> MST7MDT
+//   America/Los_Angeles -> PST8PDT
+//
+// And remove any tests not matching one of the four time zones from above.
+
+// bug 294908
+inTimeZone("EST5EDT", () => {
+    let dt = new Date(2003, Month.April, 6, 2, 30, 00);
+    assertDateTime(dt, "Sun Apr 06 2003 03:30:00 GMT-0400 (EDT)", "Eastern Daylight Time");
+});
+
+// bug 610183
+inTimeZone("PST8PDT", () => {
+    let dt = new Date(2014, Month.November, 2, 1, 47, 42);
+    assertDateTime(dt, "Sun Nov 02 2014 01:47:42 GMT-0700 (PDT)", "Pacific Daylight Time");
+});
+
+// bug 629465
+inTimeZone("MST7MDT", () => {
+    let dt1 = new Date(Date.UTC(2015, Month.November, 1, 0, 0, 0) + 6 * msPerHour);
+    assertDateTime(dt1, "Sun Nov 01 2015 00:00:00 GMT-0600 (MDT)", "Mountain Daylight Time");
+
+    let dt2 = new Date(Date.UTC(2015, Month.November, 1, 1, 0, 0) + 6 * msPerHour);
+    assertDateTime(dt2, "Sun Nov 01 2015 01:00:00 GMT-0600 (MDT)", "Mountain Daylight Time");
+
+    let dt3 = new Date(Date.UTC(2015, Month.November, 1, 1, 0, 0) + 7 * msPerHour);
+    assertDateTime(dt3, "Sun Nov 01 2015 01:00:00 GMT-0700 (MST)", "Mountain Standard Time");
+});
+
+// bug 742427
+inTimeZone("EST5EDT", () => {
+    let dt = new Date(2009, Month.March, 8, 1, 0, 0);
+    assertDateTime(dt, "Sun Mar 08 2009 01:00:00 GMT-0500 (EST)", "Eastern Standard Time");
+    dt.setHours(dt.getHours() + 1);
+    assertDateTime(dt, "Sun Mar 08 2009 03:00:00 GMT-0400 (EDT)", "Eastern Daylight Time");
+});
+inTimeZone("MST7MDT", () => {
+    let dt = new Date(2009, Month.March, 8, 1, 0, 0);
+    assertDateTime(dt, "Sun Mar 08 2009 01:00:00 GMT-0700 (MST)", "Mountain Standard Time");
+    dt.setHours(dt.getHours() + 1);
+    assertDateTime(dt, "Sun Mar 08 2009 03:00:00 GMT-0600 (MDT)", "Mountain Daylight Time");
+});
+inTimeZone("EST5EDT", () => {
+    let dt1 = new Date(Date.UTC(2008, Month.March, 9, 0, 0, 0) + 5 * msPerHour);
+    assertDateTime(dt1, "Sun Mar 09 2008 00:00:00 GMT-0500 (EST)", "Eastern Standard Time");
+
+    let dt2 = new Date(Date.UTC(2008, Month.March, 9, 1, 0, 0) + 5 * msPerHour);
+    assertDateTime(dt2, "Sun Mar 09 2008 01:00:00 GMT-0500 (EST)", "Eastern Standard Time");
+
+    let dt3 = new Date(Date.UTC(2008, Month.March, 9, 4, 0, 0) + 4 * msPerHour);
+    assertDateTime(dt3, "Sun Mar 09 2008 04:00:00 GMT-0400 (EDT)", "Eastern Daylight Time");
+});
+
+// bug 802627
+inTimeZone("EST5EDT", () => {
+    let dt = new Date(0);
+    assertDateTime(dt, "Wed Dec 31 1969 19:00:00 GMT-0500 (EST)", "Eastern Standard Time");
+});
+
+// bug 879261
+inTimeZone("EST5EDT", () => {
+    let dt1 = new Date(1362891600000);
+    assertDateTime(dt1, "Sun Mar 10 2013 00:00:00 GMT-0500 (EST)", "Eastern Standard Time");
+
+    let dt2 = new Date(dt1.setHours(dt1.getHours() + 24));
+    assertDateTime(dt2, "Mon Mar 11 2013 00:00:00 GMT-0400 (EDT)", "Eastern Daylight Time");
+});
+inTimeZone("PST8PDT", () => {
+    let dt1 = new Date(2014, Month.January, 1);
+    assertDateTime(dt1, "Wed Jan 01 2014 00:00:00 GMT-0800 (PST)", "Pacific Standard Time");
+
+    let dt2 = new Date(2014, Month.August, 1);
+    assertDateTime(dt2, "Fri Aug 01 2014 00:00:00 GMT-0700 (PDT)", "Pacific Daylight Time");
+});
+inTimeZone("EST5EDT", () => {
+    let dt1 = new Date(2016, Month.October, 14, 3, 5, 9);
+    assertDateTime(dt1, "Fri Oct 14 2016 03:05:09 GMT-0400 (EDT)", "Eastern Daylight Time");
+
+    let dt2 = new Date(2016, Month.January, 9, 23, 26, 40);
+    assertDateTime(dt2, "Sat Jan 09 2016 23:26:40 GMT-0500 (EST)", "Eastern Standard Time");
+});
+
+// bug 1084547
+inTimeZone("EST5EDT", () => {
+    let dt = new Date(Date.parse("2014-11-02T02:00:00-04:00"));
+    assertDateTime(dt, "Sun Nov 02 2014 01:00:00 GMT-0500 (EST)", "Eastern Standard Time");
+
+    dt.setMilliseconds(0);
+    assertDateTime(dt, "Sun Nov 02 2014 01:00:00 GMT-0400 (EDT)", "Eastern Daylight Time");
+});
+
+// bug 1303306
+inTimeZone("EST5EDT", () => {
+    let dt = new Date(2016, Month.September, 15, 16, 14, 48);
+    assertDateTime(dt, "Thu Sep 15 2016 16:14:48 GMT-0400 (EDT)", "Eastern Daylight Time");
+});
+
+// bug 1317364
+inTimeZone("PST8PDT", () => {
+    let dt = new Date(2016, Month.March, 13, 2, 30, 0, 0);
+    assertDateTime(dt, "Sun Mar 13 2016 03:30:00 GMT-0700 (PDT)", "Pacific Daylight Time");
+
+    let dt2 = new Date(2016, Month.January, 5, 0, 30, 30, 500);
+    assertDateTime(dt2, "Tue Jan 05 2016 00:30:30 GMT-0800 (PST)", "Pacific Standard Time");
+
+    let dt3 = new Date(dt2.getTime());
+    dt3.setMonth(dt2.getMonth() + 2);
+    dt3.setDate(dt2.getDate() + 7 + 1);
+    dt3.setHours(dt2.getHours() + 2);
+
+    assertEq(dt3.getHours(), 3);
+});
+
+// bug 1355272
+inTimeZone("PST8PDT", () => {
+    let dt = new Date(2017, Month.April, 10, 17, 25, 07);
+    assertDateTime(dt, "Mon Apr 10 2017 17:25:07 GMT-0700 (PDT)", "Pacific Daylight Time");
+});
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);