Index: llvm/trunk/tools/dsymutil/BinaryHolder.h
===================================================================
--- llvm/trunk/tools/dsymutil/BinaryHolder.h
+++ llvm/trunk/tools/dsymutil/BinaryHolder.h
@@ -19,9 +19,9 @@
 #include "llvm/Object/Error.h"
 #include "llvm/Object/MachOUniversal.h"
 #include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/Chrono.h"
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/TimeValue.h"
 
 namespace llvm {
 namespace dsymutil {
@@ -54,7 +54,8 @@
   /// potential match for the given \p Filename in the currently
   /// mapped archive if there is one.
   ErrorOr<std::vector<MemoryBufferRef>>
-  GetArchiveMemberBuffers(StringRef Filename, sys::TimeValue Timestamp);
+  GetArchiveMemberBuffers(StringRef Filename,
+                          sys::TimePoint<std::chrono::seconds> Timestamp);
 
   /// Interpret Filename as an archive member specification map the
   /// corresponding archive to memory and return the MemoryBufferRefs
@@ -62,7 +63,8 @@
   /// returned when there are multiple architectures available for the
   /// requested file.
   ErrorOr<std::vector<MemoryBufferRef>>
-  MapArchiveAndGetMemberBuffers(StringRef Filename, sys::TimeValue Timestamp);
+  MapArchiveAndGetMemberBuffers(StringRef Filename,
+                                sys::TimePoint<std::chrono::seconds> Timestamp);
 
   /// Return the MemoryBufferRef that holds the memory mapping for the
   /// given \p Filename. This function will try to parse archive
@@ -74,7 +76,8 @@
   /// Multiple buffers are returned when there are multiple
   /// architectures available for the requested file.
   ErrorOr<std::vector<MemoryBufferRef>>
-  GetMemoryBuffersForFile(StringRef Filename, sys::TimeValue Timestamp);
+  GetMemoryBuffersForFile(StringRef Filename,
+                          sys::TimePoint<std::chrono::seconds> Timestamp);
 
   void changeBackingMemoryBuffer(std::unique_ptr<MemoryBuffer> &&MemBuf);
   ErrorOr<const object::ObjectFile &> getObjfileForArch(const Triple &T);
@@ -91,13 +94,15 @@
   /// multiple architectures available for the requested file.
   ErrorOr<std::vector<const object::ObjectFile *>>
   GetObjectFiles(StringRef Filename,
-                 sys::TimeValue Timestamp = sys::TimeValue::PosixZeroTime());
+                 sys::TimePoint<std::chrono::seconds> Timestamp =
+                     sys::TimePoint<std::chrono::seconds>());
 
   /// Wraps GetObjectFiles() to return a derived ObjectFile type.
   template <typename ObjectFileType>
   ErrorOr<std::vector<const ObjectFileType *>>
   GetFilesAs(StringRef Filename,
-             sys::TimeValue Timestamp = sys::TimeValue::PosixZeroTime()) {
+             sys::TimePoint<std::chrono::seconds> Timestamp =
+                 sys::TimePoint<std::chrono::seconds>()) {
     auto ErrOrObjFile = GetObjectFiles(Filename, Timestamp);
     if (auto Err = ErrOrObjFile.getError())
       return Err;
Index: llvm/trunk/tools/dsymutil/BinaryHolder.cpp
===================================================================
--- llvm/trunk/tools/dsymutil/BinaryHolder.cpp
+++ llvm/trunk/tools/dsymutil/BinaryHolder.cpp
@@ -41,9 +41,8 @@
   CurrentMemoryBuffer = std::move(Buf);
 }
 
-ErrorOr<std::vector<MemoryBufferRef>>
-BinaryHolder::GetMemoryBuffersForFile(StringRef Filename,
-                                      sys::TimeValue Timestamp) {
+ErrorOr<std::vector<MemoryBufferRef>> BinaryHolder::GetMemoryBuffersForFile(
+    StringRef Filename, sys::TimePoint<std::chrono::seconds> Timestamp) {
   if (Verbose)
     outs() << "trying to open '" << Filename << "'\n";
 
@@ -85,9 +84,8 @@
                                   *CurrentFatBinary);
 }
 
-ErrorOr<std::vector<MemoryBufferRef>>
-BinaryHolder::GetArchiveMemberBuffers(StringRef Filename,
-                                      sys::TimeValue Timestamp) {
+ErrorOr<std::vector<MemoryBufferRef>> BinaryHolder::GetArchiveMemberBuffers(
+    StringRef Filename, sys::TimePoint<std::chrono::seconds> Timestamp) {
   if (CurrentArchives.empty())
     return make_error_code(errc::no_such_file_or_directory);
 
@@ -106,10 +104,10 @@
     for (auto Child : CurrentArchive->children(Err)) {
       if (auto NameOrErr = Child.getName()) {
         if (*NameOrErr == Filename) {
-          Expected<sys::TimeValue> ModTimeOrErr = Child.getLastModified();
+          auto ModTimeOrErr = Child.getLastModified();
           if (!ModTimeOrErr)
             return errorToErrorCode(ModTimeOrErr.takeError());
-          if (Timestamp != sys::TimeValue::PosixZeroTime() &&
+          if (Timestamp != sys::TimePoint<>() &&
               Timestamp != ModTimeOrErr.get()) {
             if (Verbose)
               outs() << "\tmember had timestamp mismatch.\n";
@@ -134,8 +132,8 @@
 }
 
 ErrorOr<std::vector<MemoryBufferRef>>
-BinaryHolder::MapArchiveAndGetMemberBuffers(StringRef Filename,
-                                            sys::TimeValue Timestamp) {
+BinaryHolder::MapArchiveAndGetMemberBuffers(
+    StringRef Filename, sys::TimePoint<std::chrono::seconds> Timestamp) {
   StringRef ArchiveFilename = Filename.substr(0, Filename.find('('));
 
   auto ErrOrBuff = MemoryBuffer::getFileOrSTDIN(ArchiveFilename);
@@ -183,7 +181,8 @@
 }
 
 ErrorOr<std::vector<const object::ObjectFile *>>
-BinaryHolder::GetObjectFiles(StringRef Filename, sys::TimeValue Timestamp) {
+BinaryHolder::GetObjectFiles(StringRef Filename,
+                             sys::TimePoint<std::chrono::seconds> Timestamp) {
   auto ErrOrMemBufferRefs = GetMemoryBuffersForFile(Filename, Timestamp);
   if (auto Err = ErrOrMemBufferRefs.getError())
     return Err;
Index: llvm/trunk/tools/dsymutil/DebugMap.h
===================================================================
--- llvm/trunk/tools/dsymutil/DebugMap.h
+++ llvm/trunk/tools/dsymutil/DebugMap.h
@@ -26,10 +26,10 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/Chrono.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/Path.h"
-#include "llvm/Support/TimeValue.h"
 #include "llvm/Support/YAMLTraits.h"
 #include <vector>
 
@@ -92,8 +92,9 @@
 
   /// This function adds an DebugMapObject to the list owned by this
   /// debug map.
-  DebugMapObject &addDebugMapObject(StringRef ObjectFilePath,
-                                    sys::TimeValue Timestamp);
+  DebugMapObject &
+  addDebugMapObject(StringRef ObjectFilePath,
+                    sys::TimePoint<std::chrono::seconds> Timestamp);
 
   const Triple &getTriple() const { return BinaryTriple; }
 
@@ -149,7 +150,9 @@
 
   llvm::StringRef getObjectFilename() const { return Filename; }
 
-  sys::TimeValue getTimestamp() const { return Timestamp; }
+  sys::TimePoint<std::chrono::seconds> getTimestamp() const {
+    return Timestamp;
+  }
 
   iterator_range<StringMap<SymbolMapping>::const_iterator> symbols() const {
     return make_range(Symbols.begin(), Symbols.end());
@@ -162,10 +165,11 @@
 private:
   friend class DebugMap;
   /// DebugMapObjects can only be constructed by the owning DebugMap.
-  DebugMapObject(StringRef ObjectFilename, sys::TimeValue Timestamp);
+  DebugMapObject(StringRef ObjectFilename,
+                 sys::TimePoint<std::chrono::seconds> Timestamp);
 
   std::string Filename;
-  sys::TimeValue Timestamp;
+  sys::TimePoint<std::chrono::seconds> Timestamp;
   StringMap<SymbolMapping> Symbols;
   DenseMap<uint64_t, DebugMapEntry *> AddressToMapping;
 
Index: llvm/trunk/tools/dsymutil/DebugMap.cpp
===================================================================
--- llvm/trunk/tools/dsymutil/DebugMap.cpp
+++ llvm/trunk/tools/dsymutil/DebugMap.cpp
@@ -21,7 +21,7 @@
 using namespace llvm::object;
 
 DebugMapObject::DebugMapObject(StringRef ObjectFilename,
-                               sys::TimeValue Timestamp)
+                               sys::TimePoint<std::chrono::seconds> Timestamp)
     : Filename(ObjectFilename), Timestamp(Timestamp) {}
 
 bool DebugMapObject::addSymbol(StringRef Name, Optional<uint64_t> ObjectAddress,
@@ -62,8 +62,9 @@
 void DebugMapObject::dump() const { print(errs()); }
 #endif
 
-DebugMapObject &DebugMap::addDebugMapObject(StringRef ObjectFilePath,
-                                            sys::TimeValue Timestamp) {
+DebugMapObject &
+DebugMap::addDebugMapObject(StringRef ObjectFilePath,
+                            sys::TimePoint<std::chrono::seconds> Timestamp) {
   Objects.emplace_back(new DebugMapObject(ObjectFilePath, Timestamp));
   return *Objects.back();
 }
@@ -132,7 +133,7 @@
   dsymutil::DebugMapObject denormalize(IO &IO);
 
   std::string Filename;
-  sys::TimeValue::SecondsType Timestamp;
+  int64_t Timestamp;
   std::vector<dsymutil::DebugMapObject::YAMLSymbolMapping> Entries;
 };
 
@@ -202,7 +203,7 @@
 MappingTraits<dsymutil::DebugMapObject>::YamlDMO::YamlDMO(
     IO &io, dsymutil::DebugMapObject &Obj) {
   Filename = Obj.Filename;
-  Timestamp = Obj.getTimestamp().toEpochTime();
+  Timestamp = sys::toTimeT(Obj.getTimestamp());
   Entries.reserve(Obj.Symbols.size());
   for (auto &Entry : Obj.Symbols)
     Entries.push_back(std::make_pair(Entry.getKey(), Entry.getValue()));
@@ -240,9 +241,7 @@
     }
   }
 
-  sys::TimeValue TV;
-  TV.fromEpochTime(Timestamp);
-  dsymutil::DebugMapObject Res(Path, TV);
+  dsymutil::DebugMapObject Res(Path, sys::toTimePoint(Timestamp));
   for (auto &Entry : Entries) {
     auto &Mapping = Entry.second;
     Optional<uint64_t> ObjAddress;
Index: llvm/trunk/tools/dsymutil/DwarfLinker.cpp
===================================================================
--- llvm/trunk/tools/dsymutil/DwarfLinker.cpp
+++ llvm/trunk/tools/dsymutil/DwarfLinker.cpp
@@ -3294,7 +3294,7 @@
     sys::path::append(Path, Filename);
   BinaryHolder ObjHolder(Options.Verbose);
   auto &Obj =
-      ModuleMap.addDebugMapObject(Path, sys::TimeValue::PosixZeroTime());
+      ModuleMap.addDebugMapObject(Path, sys::TimePoint<std::chrono::seconds>());
   auto ErrOrObj = loadObject(ObjHolder, Obj, ModuleMap);
   if (!ErrOrObj) {
     // Try and emit more helpful warnings by applying some heuristics.
Index: llvm/trunk/tools/dsymutil/MachODebugMapParser.cpp
===================================================================
--- llvm/trunk/tools/dsymutil/MachODebugMapParser.cpp
+++ llvm/trunk/tools/dsymutil/MachODebugMapParser.cpp
@@ -65,7 +65,9 @@
   std::unique_ptr<DebugMap> parseOneBinary(const MachOObjectFile &MainBinary,
                                            StringRef BinaryPath);
 
-  void switchToNewDebugMapObject(StringRef Filename, sys::TimeValue Timestamp);
+  void
+  switchToNewDebugMapObject(StringRef Filename,
+                            sys::TimePoint<std::chrono::seconds> Timestamp);
   void resetParserState();
   uint64_t getMainBinarySymbolAddress(StringRef Name);
   void loadMainBinarySymbols(const MachOObjectFile &MainBinary);
@@ -110,8 +112,8 @@
 /// Create a new DebugMapObject. This function resets the state of the
 /// parser that was referring to the last object file and sets
 /// everything up to add symbols to the new one.
-void MachODebugMapParser::switchToNewDebugMapObject(StringRef Filename,
-                                                    sys::TimeValue Timestamp) {
+void MachODebugMapParser::switchToNewDebugMapObject(
+    StringRef Filename, sys::TimePoint<std::chrono::seconds> Timestamp) {
   resetParserState();
 
   SmallString<80> Path(PathPrefix);
@@ -343,11 +345,8 @@
   const char *Name = &MainBinaryStrings.data()[StringIndex];
 
   // An N_OSO entry represents the start of a new object file description.
-  if (Type == MachO::N_OSO) {
-    sys::TimeValue Timestamp;
-    Timestamp.fromEpochTime(Value);
-    return switchToNewDebugMapObject(Name, Timestamp);
-  }
+  if (Type == MachO::N_OSO)
+    return switchToNewDebugMapObject(Name, sys::toTimePoint(Value));
 
   // If the last N_OSO object file wasn't found,
   // CurrentDebugMapObject will be null. Do not update anything