diff --git a/src/cmd/go/testdata/vcstest/svn/hello.txt b/src/cmd/go/testdata/vcstest/svn/hello.txt
index b68ce95969..526d00fc4b 100644
--- a/src/cmd/go/testdata/vcstest/svn/hello.txt
+++ b/src/cmd/go/testdata/vcstest/svn/hello.txt
@@ -1,6 +1,7 @@
 handle svn
 
-env TZ='America/New_York'
+# Ensure SVN displays dates using UTC.
+env TZ=''
 
 mkdir db/transactions
 mkdir db/txn-protorevs
@@ -30,7 +31,7 @@ func main() {
 }
 -- .checkout/.svn-log --
 ------------------------------------------------------------------------
-r1 | rsc | 2017-09-21 21:12:45 -0400 (Thu, 21 Sep 2017) | 3 lines
+r1 | rsc | 2017-09-22 01:12:45 +0000 (Fri, 22 Sep 2017) | 3 lines
 
 hello world
 
diff --git a/src/cmd/go/testdata/vcstest/svn/test1-svn-git.txt b/src/cmd/go/testdata/vcstest/svn/test1-svn-git.txt
index 06ceef1a41..3190e823e5 100644
--- a/src/cmd/go/testdata/vcstest/svn/test1-svn-git.txt
+++ b/src/cmd/go/testdata/vcstest/svn/test1-svn-git.txt
@@ -13,7 +13,9 @@ env GIT_AUTHOR_NAME='Russ Cox'
 env GIT_AUTHOR_EMAIL='rsc@golang.org'
 env GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
 env GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL
-env TZ='America/New_York'
+
+# Ensure SVN displays dates using UTC.
+env TZ=''
 
 mkdir db/transactions
 mkdir db/txn-protorevs
@@ -108,23 +110,23 @@ import _ "vcs-test.swtch.com/go/test1-svn-git/git-README-only/other"
 package tiny
 -- .checkout/.svn-log --
 ------------------------------------------------------------------------
-r5 | rsc | 2017-10-04 11:08:26 -0400 (Wed, 04 Oct 2017) | 1 line
+r5 | rsc | 2017-10-04 15:08:26 +0000 (Wed, 04 Oct 2017) | 1 line
 
 move from vcs-test.swtch.com to vcs-test.golang.org
 ------------------------------------------------------------------------
-r4 | rsc | 2017-09-27 13:48:18 -0400 (Wed, 27 Sep 2017) | 1 line
+r4 | rsc | 2017-09-27 17:48:18 +0000 (Wed, 27 Sep 2017) | 1 line
 
 add tiny
 ------------------------------------------------------------------------
-r3 | rsc | 2017-09-22 12:56:16 -0400 (Fri, 22 Sep 2017) | 1 line
+r3 | rsc | 2017-09-22 16:56:16 +0000 (Fri, 22 Sep 2017) | 1 line
 
 add other
 ------------------------------------------------------------------------
-r2 | rsc | 2017-09-22 11:49:11 -0400 (Fri, 22 Sep 2017) | 1 line
+r2 | rsc | 2017-09-22 15:49:11 +0000 (Fri, 22 Sep 2017) | 1 line
 
 use git-README-only/pkg
 ------------------------------------------------------------------------
-r1 | rsc | 2017-09-22 11:41:54 -0400 (Fri, 22 Sep 2017) | 1 line
+r1 | rsc | 2017-09-22 15:41:54 +0000 (Fri, 22 Sep 2017) | 1 line
 
 add modified git-README-only
 ------------------------------------------------------------------------
diff --git a/src/cmd/go/testdata/vcstest/svn/test2-svn-git.txt b/src/cmd/go/testdata/vcstest/svn/test2-svn-git.txt
index 71d84c45c2..ee0f90996b 100644
--- a/src/cmd/go/testdata/vcstest/svn/test2-svn-git.txt
+++ b/src/cmd/go/testdata/vcstest/svn/test2-svn-git.txt
@@ -13,7 +13,9 @@ env GIT_AUTHOR_NAME='Russ Cox'
 env GIT_AUTHOR_EMAIL='rsc@golang.org'
 env GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
 env GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL
-env TZ='America/New_York'
+
+# Ensure SVN displays dates using UTC.
+env TZ=''
 
 mkdir db/transactions
 mkdir db/txn-protorevs
@@ -86,15 +88,15 @@ README
 package p1
 -- .checkout/.svn-log --
 ------------------------------------------------------------------------
-r3 | rsc | 2017-10-04 11:09:35 -0400 (Wed, 04 Oct 2017) | 1 line
+r3 | rsc | 2017-10-04 15:09:35 +0000 (Wed, 04 Oct 2017) | 1 line
 
 move from vcs-test.swtch.com to vcs-test.golang.org
 ------------------------------------------------------------------------
-r2 | rsc | 2017-09-27 14:16:14 -0400 (Wed, 27 Sep 2017) | 1 line
+r2 | rsc | 2017-09-27 18:16:14 +0000 (Wed, 27 Sep 2017) | 1 line
 
 add p1
 ------------------------------------------------------------------------
-r1 | rsc | 2017-09-27 14:00:52 -0400 (Wed, 27 Sep 2017) | 1 line
+r1 | rsc | 2017-09-27 18:00:52 +0000 (Wed, 27 Sep 2017) | 1 line
 
 git
 ------------------------------------------------------------------------