third_party/WebKit/LayoutTests/fast/js/script-tests/date-big-setdate.js

   1 description(
   2 'This test checks for regression against: <a href="http://bugs.webkit.org/show_bug.cgi?id=3381"> 3381 Date.prototype.setDate() incorrect for values >=128.</a> <br /> <a href="http://bugs.webkit.org/show_bug.cgi?id=12975">12975: DST changes in US affect JavaScript date calculations</a>'
   3 );
   4
   5
   6 var validVars = false;
   7 var curValue;
   8 var success = true;
   9 var millisecondsPerDay = 1000 * 60 * 60 * 24;
  10 var millisecondsPerHour = 1000 * 60 * 60;
  11
  12 for (var i = 116; i < 126; i++) {
  13     var d = new Date(0);
  14     d.setDate(i);
  15     if (validVars)
  16         shouldBe("d.valueOf() - curValue", "millisecondsPerDay");
  17
  18     curValue = d.valueOf();
  19     validVars = true;
  20 }
  21
  22 var testCases = [];
  23 if ((new Date(2009, 9, 1)).toString().match("PDT")) {
  24     // Added a special case that should represent a change in DST.  DST did not actually
  25     // change on this date but because of the wierdness of how JavaScriptDates are
  26 // expected to interpolate DST as opposed to reflect acurate history, this day
  27     // (April 5th 1970) should show a DST change.
  28     testCases.push([new Date(0), 97, 98]);
  29
  30     // Added more special cases. These dates match the recent DST changes in the US.
  31     // These tests check that the new changes are correctly propogated to the past and
  32     // all of the tests should show DST occurring on the same date.
  33     testCases.push([new Date(1970, 0,0,0,0,0,0), 98, 99]);
  34     testCases.push([new Date(1998, 0,0,0,0,0,0), 98, 99]);
  35     testCases.push([new Date(2026, 0,0,0,0,0,0), 98, 99]);
  36     testCases.push([new Date(2054, 0,0,0,0,0,0), 98, 99]);
  37 }
  38
  39 var errors = [];
  40 for (var i = 0; i < testCases.length; i++) {
  41     var c = testCases[i][0];
  42     var d = new Date(c);
  43     c.setDate(testCases[i][1]);
  44     d.setDate(testCases[i][2]);
  45
  46     var actual = d.valueOf() - c.valueOf();
  47     var expected = millisecondsPerDay - millisecondsPerHour;
  48     if (actual != expected) {
  49         errors.push("Unexpected difference between two days (expected: " + expected + ", actual: " +  actual + ") for " + testCases[i][0]);
  50     }
  51 }
  52
  53 if (errors.length) {
  54     testFailed(errors.length + "/" + testCases.length + " tests were failed: " + errors.join(", "));
  55 } else {
  56     testPassed("Passed all tests for DST (or skipped the tests if your timezone isn't PST/PDT)");
  57 }