--- a/mercurial/archival.py	Sun Sep 09 12:43:24 2012 -0400
+++ b/mercurial/archival.py	Tue Sep 18 19:46:15 2012 +0900
@@ -12,6 +12,7 @@
 import scmutil, util, encoding
 import cStringIO, os, tarfile, time, zipfile
 import zlib, gzip
+import struct
 
 def tidyprefix(dest, kind, prefix):
     '''choose prefix to use for names in archive.  make sure prefix is
@@ -165,6 +166,7 @@
         if mtime < epoch:
             mtime = epoch
 
+        self.mtime = mtime
         self.date_time = time.gmtime(mtime)[:6]
 
     def addfile(self, name, mode, islink, data):
@@ -178,6 +180,14 @@
             mode = 0777
             ftype = 0xa000 # UNX_IFLNK in unzip source code
         i.external_attr = (mode | ftype) << 16L
+        # add "extended-timestamp" extra block, because zip archives
+        # without this will be extracted with unexpected timestamp,
+        # if TZ is not configured as GMT
+        i.extra += struct.pack('<hhBl',
+                               0x5455,     # block type: "extended-timestamp"
+                               1 + 4,      # size of this block
+                               1,          # "modification time is present"
+                               self.mtime) # time of last modification (UTC)
         self.z.writestr(i, data)
 
     def done(self):