diff --git a/llvm/test/tools/llvm-readobj/XCOFF/file-header.test b/llvm/test/tools/llvm-readobj/XCOFF/file-header.test
--- a/llvm/test/tools/llvm-readobj/XCOFF/file-header.test
+++ b/llvm/test/tools/llvm-readobj/XCOFF/file-header.test
@@ -10,7 +10,7 @@
 # FILEHEADER32-NEXT:FileHeader {
 # FILEHEADER32-NEXT:  Magic: 0x1DF
 # FILEHEADER32-NEXT:  NumberOfSections: 1
-# FILEHEADER32-NEXT:  TimeStamp: 1970-01-01T00:00:01Z (0x1)
+# FILEHEADER32-NEXT:  TimeStamp: 1970-01-01 00:00:01 (0x1)
 # FILEHEADER32-NEXT:  SymbolTableOffset: 0x3C
 # FILEHEADER32-NEXT:  SymbolTableEntries: 1
 # FILEHEADER32-NEXT:  OptionalHeaderSize: 0x0
diff --git a/llvm/tools/llvm-readobj/XCOFFDumper.cpp b/llvm/tools/llvm-readobj/XCOFFDumper.cpp
--- a/llvm/tools/llvm-readobj/XCOFFDumper.cpp
+++ b/llvm/tools/llvm-readobj/XCOFFDumper.cpp
@@ -98,10 +98,11 @@
     // tests will let us know.
     time_t TimeDate = TimeStamp;
 
-    char FormattedTime[21] = {};
-    size_t BytesWritten =
-        strftime(FormattedTime, 21, "%Y-%m-%dT%H:%M:%SZ", gmtime(&TimeDate));
-    if (BytesWritten)
+    char FormattedTime[80] = {};
+
+    size_t BytesFormatted =
+      strftime(FormattedTime, sizeof(FormattedTime), "%F %T", gmtime(&TimeDate));
+    if (BytesFormatted)
       W.printHex("TimeStamp", FormattedTime, TimeStamp);
     else
       W.printHex("Timestamp", TimeStamp);