Index: MinGW/Driver.cpp
===================================================================
--- MinGW/Driver.cpp
+++ MinGW/Driver.cpp
@@ -187,7 +187,7 @@
       Args.getLastArgValue(OPT_m) != "arm64pe" && !Args.hasArg(OPT_dynamicbase))
     Add("-dynamicbase:no");
 
-  if (Args.hasArg(OPT_no_insert_timestamp))
+  if (Args.hasFlag(OPT_no_insert_timestamp, OPT_insert_timestamp, false))
     Add("-timestamp:0");
 
   if (Args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false))
Index: MinGW/Options.td
===================================================================
--- MinGW/Options.td
+++ MinGW/Options.td
@@ -16,6 +16,8 @@
 def gc_sections: F<"gc-sections">, HelpText<"Remove unused sections">;
 def icf: J<"icf=">, HelpText<"Identical code folding">;
 def image_base: S<"image-base">, HelpText<"Base address of the program">;
+def insert_timestamp: F<"insert-timestamp">,
+    HelpText<"Include PE header timestamp">;
 def kill_at: F<"kill-at">, HelpText<"Remove @n from exported symbols">;
 def l: JoinedOrSeparate<["-"], "l">, MetaVarName<"<libName>">,
   HelpText<"Root name of library to use">;
Index: test/MinGW/driver.test
===================================================================
--- test/MinGW/driver.test
+++ test/MinGW/driver.test
@@ -153,4 +153,7 @@
 LIBPATH: -libpath:libpath
 
 RUN: ld.lld -### -m i386pep foo.o --no-insert-timestamp | FileCheck -check-prefix NOTIMESTAMP %s
+RUN: ld.lld -### -m i386pep foo.o --insert-timestamp --no-insert-timestamp | FileCheck -check-prefix NOTIMESTAMP %s
 NOTIMESTAMP: -timestamp:0
+RUN: ld.lld -### -m i386pep foo.o --no-insert-timestamp --insert-timestamp | FileCheck -check-prefix TIMESTAMP %s
+TIMESTAMP-NOT: -timestamp:0