diff --git a/clang/test/Modules/prune.m b/clang/test/Modules/prune.m
index 2e2c2eee7757..062156ec7c60 100644
--- a/clang/test/Modules/prune.m
+++ b/clang/test/Modules/prune.m
@@ -19,7 +19,7 @@
 
 // Set the timestamp back more than two days. We should try to prune,
 // but nothing gets pruned because the module files are new enough.
-// RUN: touch -m -a -A -481200 %t/modules.timestamp 
+// RUN: touch -m -a -t 201101010000 %t/modules.timestamp 
 // RUN: %clang_cc1 -fmodules -F %S/Inputs -fmodules-cache-path=%t -fmodules -fmodules-prune-interval=172800 -fmodules-prune-after=345600 %s -verify
 // RUN: ls %t | grep modules.timestamp
 // RUN: ls -R %t | grep ^Module.pcm
@@ -28,7 +28,7 @@
 // Set the DependsOnModule access time back more than four days.
 // This shouldn't prune anything, because the timestamp has been updated, so
 // the pruning mechanism won't fire.
-// RUN: touch -a -A -961200 `find /Volumes/Data/dgregor/Projects/llvm-build-xcode/tools/clang/test/Modules/Output/prune.m.tmp -name DependsOnModule.pcm`
+// RUN: touch -a -t 201101010000 `find /Volumes/Data/dgregor/Projects/llvm-build-xcode/tools/clang/test/Modules/Output/prune.m.tmp -name DependsOnModule.pcm`
 // RUN: %clang_cc1 -fmodules -F %S/Inputs -fmodules-cache-path=%t -fmodules -fmodules-prune-interval=172800 -fmodules-prune-after=345600 %s -verify
 // RUN: ls %t | grep modules.timestamp
 // RUN: ls -R %t | grep ^Module.pcm
@@ -36,8 +36,8 @@
 
 // Set both timestamp and DependsOnModule.pcm back beyond the cutoff.
 // This should trigger pruning, which will remove DependsOnModule but not Module.
-// RUN: touch -m -a -A -481200 %t/modules.timestamp 
-// RUN: touch -a -A -961200 `find /Volumes/Data/dgregor/Projects/llvm-build-xcode/tools/clang/test/Modules/Output/prune.m.tmp -name DependsOnModule.pcm`
+// RUN: touch -m -a -t 201101010000 %t/modules.timestamp 
+// RUN: touch -a -t 201101010000 `find /Volumes/Data/dgregor/Projects/llvm-build-xcode/tools/clang/test/Modules/Output/prune.m.tmp -name DependsOnModule.pcm`
 // RUN: %clang_cc1 -fmodules -F %S/Inputs -fmodules-cache-path=%t -fmodules -fmodules-prune-interval=172800 -fmodules-prune-after=345600 %s -verify
 // RUN: ls %t | grep modules.timestamp
 // RUN: ls -R %t | grep ^Module.pcm