diff --git a/hgext3rd/tweakdefaults.py b/hgext3rd/tweakdefaults.py
--- a/hgext3rd/tweakdefaults.py
+++ b/hgext3rd/tweakdefaults.py
@@ -342,6 +342,7 @@
 def commitcmd(orig, ui, repo, *pats, **opts):
     if (opts.get("amend")
             and not opts.get("date")
+            and not opts.get("to")
             and not ui.configbool('tweakdefaults', 'amendkeepdate')):
         opts["date"] = currentdate()
 
@@ -733,8 +734,9 @@
     return orig(ui, repo, *revs, **opts)
 
 def amendcmd(orig, ui, repo, *pats, **opts):
-    if not opts.get("date") and not ui.configbool('tweakdefaults',
-                                                  'amendkeepdate'):
+    if (not opts.get("date")
+        and not opts.get("to")
+        and not ui.configbool('tweakdefaults', 'amendkeepdate')):
         opts["date"] = currentdate()
     return orig(ui, repo, *pats, **opts)
 
diff --git a/tests/test-tweakdefaults.t b/tests/test-tweakdefaults.t
--- a/tests/test-tweakdefaults.t
+++ b/tests/test-tweakdefaults.t
@@ -360,17 +360,26 @@
   $ touch new_file
   $ hg commit -d "0 0" -Aqm "commit for amend"
   $ echo x > new_file
-  $ hg commit -q --amend -m "amended message" --config tweakdefaults.amendkeepdate=True
+  $ hg amend -q -m "amended message" --config tweakdefaults.amendkeepdate=True
   $ hg log -l 1 -T "{date} {rev}\n"
   0.00 8
 
+Test amend --to doesn't give a flag error when tweakdefaults.amendkeepdate is set
+  $ echo q > new_file
+  $ hg amend --to 8 --config tweakdefaults.amendkeepdate=False
+  hg: parse error: pick "3903775176ed" changeset was not a candidate
+  (only use listed changesets)
+  [255]
+  $ hg log -l 1 -T "{date} {rev}\n"
+  0.00 9
+
 Test commit --amend date when tweakdefaults.amendkeepdate is set
   $ echo a >> new_file
   $ hg commit -d "0 0" -Aqm "commit for amend"
   $ echo x > new_file
   $ hg commit -q --amend -m "amended message" --config tweakdefaults.amendkeepdate=True
   $ hg log -l 1 -T "{date} {rev}\n"
-  0.00 9
+  0.00 10
 
 Test commit --amend date when tweakdefaults.amendkeepdate is not set and --date is provided
   $ echo xxx > a
@@ -378,7 +387,7 @@
   $ echo x > a
   $ hg commit -q --amend -m "amended message" --date "1 1"
   $ hg log -l 1 -T "{date} {rev}\n"
-  1.01 10
+  1.01 11
 
 Test rebase date when tweakdefaults.rebasekeepdate is not set
   $ echo test_1 > rebase_dest
@@ -390,7 +399,7 @@
   $ hg bookmark rebase_source_test_1
   $ hg rebase -q -s rebase_source_test_1 -d rebase_dest_test_1
   $ hg log -l 1 -T "{rev}\n" -d "yesterday to today"
-  12
+  13
 
 Test rebase date when tweakdefaults.rebasekeepdate is set
   $ echo test_2 > rebase_dest
@@ -402,8 +411,8 @@
   $ hg bookmark rebase_source_test_2
   $ hg rebase -q -s rebase_source_test_2 -d rebase_dest_test_2 --config tweakdefaults.rebasekeepdate=True
   $ hg log -l 2 -T "{date} {rev}\n"
+  0.00 15
   0.00 14
-  0.00 13
 
 Test reuse message flag by taking message from previous commit
   $ cd ../..