document.lastModified should consider user's local time zone

LayoutTests/http/tests/misc/last-modified-parsing.html

Index: LayoutTests/http/tests/misc/last-modified-parsing.html
diff --git a/LayoutTests/http/tests/misc/last-modified-parsing.html b/LayoutTests/http/tests/misc/last-modified-parsing.html
index e9bd793450755ab0bc5b8812d1c5b9e38d3d020d..73d0ee820172c3854062613486e1ba31dd255e47 100644
--- a/LayoutTests/http/tests/misc/last-modified-parsing.html
+++ b/LayoutTests/http/tests/misc/last-modified-parsing.html
@@ -4,8 +4,25 @@ if (window.testRunner) {
     testRunner.dumpChildFramesAsText();
 }
 
+function getExpectedLastModified(lastModified) {
+    var date = new Date(lastModified);
+    if (window.internals) {
+        var offset = date.getTimezoneOffset() * 60 * 1000;
+        var ms = date.getTime() + offset;
+        date = new Date(internals.convertToLocalTime(ms));

[tkent, 2014/07/24 06:20:05]

Did you investigate why local time representation of JavaScript Date and
WTF::convertToLocalTIme were mismatched?  Please don't avoid the problem by
internals.convertToLocalTime.

[kangil_, 2014/07/24 11:35:28]

After further investigation, I've found that calculating dst offset is different
between Date[1] and DateMath[2].
IMHO, implementation in Date is more appropriate, so I will make DateMath use
same calculation logic.
Will be back with code. :)

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/v8/src/base/platfo...
[2]
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

+    }
+    var month = ("0" + (date.getMonth() + 1)).slice(-2);
+    var day = ("0" + date.getDate()).slice(-2);
+    var hour = ("0" + date.getHours()).slice(-2);
+    var minute = ("0" + date.getMinutes()).slice(-2);
+    var second = ("0" + date.getSeconds()).slice(-2);
+    var result = month + '/' + day + '/' + date.getFullYear() + ' ' + hour + ':' + minute + ':' + second;
+    return result;
+}
+
 function test(text) {
-    document.write('<iframe src="../resources/last-modified.php?date=' + escape(text) + '"></iframe>');
+    var url = '../resources/last-modified.php?date=' + escape(text) + '&expected=' + escape(getExpectedLastModified(text));
+    document.write('<iframe id="test" src="' + url + '"></iframe>');
 }
 
 test('Mon, 21 Nov 2008 01:03:33 GMT');