diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -6303,6 +6303,9 @@
 def disable_pragma_debug_crash : Flag<["-"], "disable-pragma-debug-crash">,
   HelpText<"Disable any #pragma clang __debug that can lead to crashing behavior. This is meant for testing.">,
   MarshallingInfoFlag<PreprocessorOpts<"DisablePragmaDebugCrash">>;
+def source_date_epoch : Separate<["-"], "source-date-epoch">,
+  MetaVarName<"<time since Epoch in seconds>">,
+  HelpText<"Time to be used in __DATE__, __TIME__, and __TIMESTAMP__ macros">;
 
 } // let Flags = [CC1Option, NoDriverOption]
 
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -1462,6 +1462,11 @@
 
   Args.AddLastArg(CmdArgs, options::OPT_ffile_reproducible,
                   options::OPT_fno_file_reproducible);
+
+  if (const char *Epoch = std::getenv("SOURCE_DATE_EPOCH")) {
+    CmdArgs.push_back("-source-date-epoch");
+    CmdArgs.push_back(Args.MakeArgString(Epoch));
+  }
 }
 
 // FIXME: Move to target hook.
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -4227,6 +4227,9 @@
   for (const auto &RF : Opts.RemappedFiles)
     GenerateArg(Args, OPT_remap_file, RF.first + ";" + RF.second, SA);
 
+  if (Opts.SourceDateEpoch)
+    GenerateArg(Args, OPT_source_date_epoch, Twine(*Opts.SourceDateEpoch), SA);
+
   // Don't handle LexEditorPlaceholders. It is implied by the action that is
   // generated elsewhere.
 }
@@ -4309,14 +4312,15 @@
     Opts.addRemappedFile(Split.first, Split.second);
   }
 
-  if (const char *Epoch = std::getenv("SOURCE_DATE_EPOCH")) {
+  if (const Arg *A = Args.getLastArg(OPT_source_date_epoch)) {
+    StringRef Epoch = A->getValue();
     // SOURCE_DATE_EPOCH, if specified, must be a non-negative decimal integer.
     // On time64 systems, pick 253402300799 (the UNIX timestamp of
     // 9999-12-31T23:59:59Z) as the upper bound.
     const uint64_t MaxTimestamp =
         std::min<uint64_t>(std::numeric_limits<time_t>::max(), 253402300799);
     uint64_t V;
-    if (StringRef(Epoch).getAsInteger(10, V) || V > MaxTimestamp) {
+    if (Epoch.getAsInteger(10, V) || V > MaxTimestamp) {
       Diags.Report(diag::err_fe_invalid_source_date_epoch)
           << Epoch << MaxTimestamp;
     } else {
diff --git a/clang/test/Driver/SOURCE_DATE_EPOCH.c b/clang/test/Driver/SOURCE_DATE_EPOCH.c
new file mode 100644
--- /dev/null
+++ b/clang/test/Driver/SOURCE_DATE_EPOCH.c
@@ -0,0 +1,5 @@
+// RUN: %clang -E %s -### 2>&1 | FileCheck %s -check-prefix=NO_EPOCH
+// NO_EPOCH-NOT: "-source-date-epoch"
+
+// RUN: env SOURCE_DATE_EPOCH=123 %clang -E %s -### 2>&1 | FileCheck %s
+// CHECK: "-source-date-epoch" "123"
diff --git a/clang/test/Preprocessor/SOURCE_DATE_EPOCH.c b/clang/test/Preprocessor/SOURCE_DATE_EPOCH.c
--- a/clang/test/Preprocessor/SOURCE_DATE_EPOCH.c
+++ b/clang/test/Preprocessor/SOURCE_DATE_EPOCH.c
@@ -1,10 +1,10 @@
-// RUN: env SOURCE_DATE_EPOCH=0 %clang_cc1 -E %s | FileCheck %s --check-prefix=19700101
+// RUN: %clang_cc1 -source-date-epoch 0 -E %s | FileCheck %s --check-prefix=19700101
 
 // 19700101:      const char date[] = "Jan  1 1970";
 // 19700101-NEXT: const char time[] = "00:00:00";
 // 19700101-NEXT: const char timestamp[] = "Thu Jan  1 00:00:00 1970";
 
-// RUN: env SOURCE_DATE_EPOCH=2147483647 %clang_cc1 -E -Wdate-time %s 2>&1 | FileCheck %s --check-prefix=Y2038
+// RUN: %clang_cc1 -source-date-epoch 2147483647 -E -Wdate-time %s 2>&1 | FileCheck %s --check-prefix=Y2038
 
 // Y2038:      warning: expansion of date or time macro is not reproducible [-Wdate-time]
 // Y2038:      const char date[] = "Jan 19 2038";
@@ -12,18 +12,18 @@
 // Y2038-NEXT: const char timestamp[] = "Tue Jan 19 03:14:07 2038";
 
 /// Test a large timestamp if the system uses 64-bit time_t and known to support large timestamps.
-// RUN: %if !system-windows && clang-target-64-bits %{ env SOURCE_DATE_EPOCH=253402300799 %clang_cc1 -E -Wdate-time %s 2>&1 | FileCheck %s --check-prefix=99991231 %}
+// RUN: %if !system-windows && clang-target-64-bits %{ %clang_cc1 -source-date-epoch 253402300799 -E -Wdate-time %s 2>&1 | FileCheck %s --check-prefix=99991231 %}
 
 // 99991231:      warning: expansion of date or time macro is not reproducible [-Wdate-time]
 // 99991231:      const char date[] = "Dec 31 9999";
 // 99991231-NEXT: const char time[] = "23:59:59";
 // 99991231-NEXT: const char timestamp[] = "Fri Dec 31 23:59:59 9999";
 
-// RUN: env SOURCE_DATE_EPOCH=253402300800 not %clang_cc1 -E %s 2>&1 | FileCheck %s --check-prefix=TOOBIG
+// RUN: not %clang_cc1 -source-date-epoch 253402300800 -E %s 2>&1 | FileCheck %s --check-prefix=TOOBIG
 
 // TOOBIG: error: environment variable 'SOURCE_DATE_EPOCH' ('253402300800') must be a non-negative decimal integer <= {{(2147483647|253402300799)}}
 
-// RUN: env SOURCE_DATE_EPOCH=0x0 not %clang_cc1 -E %s 2>&1 | FileCheck %s --check-prefix=NOTDECIMAL
+// RUN: not %clang_cc1 -source-date-epoch 0x0 -E %s 2>&1 | FileCheck %s --check-prefix=NOTDECIMAL
 
 // NOTDECIMAL: error: environment variable 'SOURCE_DATE_EPOCH' ('0x0') must be a non-negative decimal integer <= {{(2147483647|253402300799)}}