1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/non262/Date/time-zone-2038-pst.js b/js/src/tests/non262/Date/time-zone-2038-pst.js
new file mode 100644
index 0000000000..2abad4dbfd
--- /dev/null
+++ b/js/src/tests/non262/Date/time-zone-2038-pst.js
@@ -0,0 +1,43 @@
+// |reftest| skip-if(!xulRuntime.shell)
+
+assertEq(/^(PST|PDT)$/.test(getTimeZone()), true,
+         "The default time zone is set to PST8PDT for all jstests (when run in the shell)");
+
+// U.S. daylight saving rules changed in 2007, excerpt from tzdata's
+// northamerica file:
+// NAME  FROM  TO    IN   ON       AT    SAVE  LETTER/S
+// US    1967  2006  Oct  lastSun  2:00  0     S
+// US    1967  1973  Apr  lastSun  2:00  1:00  D
+// US    1974  only  Jan  6        2:00  1:00  D
+// US    1975  only  Feb  23       2:00  1:00  D
+// US    1976  1986  Apr  lastSun  2:00  1:00  D
+// US    1987  2006  Apr  Sun>=1   2:00  1:00  D
+// US    2007  max   Mar  Sun>=8   2:00  1:00  D
+// US    2007  max   Nov  Sun>=1   2:00  0     S
+
+
+// When 2040 is mapped to 1984, the old U.S. rules are applied, i.e. DST isn't
+// yet observed on March 31. If mapped to 2012, the new U.S. rules are applied
+// and DST is already observed, which is the expected behaviour.
+// A similar effect is visible in November.
+// NOTE: This test expects that 2012 and 2040 use the same DST rules. If this
+//       ever changes, the test needs to be updated accordingly.
+{
+    let dt1 = new Date(2040, Month.March, 31);
+    assertDateTime(dt1, "Sat Mar 31 2040 00:00:00 GMT-0700 (PDT)", "Pacific Daylight Time");
+
+    let dt2 = new Date(2040, Month.November, 1);
+    assertDateTime(dt2, "Thu Nov 01 2040 00:00:00 GMT-0700 (PDT)", "Pacific Daylight Time");
+}
+
+// 2038 is mapped to 2027 instead of 1971.
+{
+    let dt1 = new Date(2038, Month.March, 31);
+    assertDateTime(dt1, "Wed Mar 31 2038 00:00:00 GMT-0700 (PDT)", "Pacific Daylight Time");
+
+    let dt2 = new Date(2038, Month.November, 1);
+    assertDateTime(dt2, "Mon Nov 01 2038 00:00:00 GMT-0700 (PDT)", "Pacific Daylight Time");
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);