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diff --git a/deps/v8/src/objects/js-relative-time-format.h b/deps/v8/src/objects/js-relative-time-format.h
new file mode 100644
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+++ b/deps/v8/src/objects/js-relative-time-format.h
@@ -0,0 +1,105 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_INTL_SUPPORT
+#error Internationalization is expected to be enabled.
+#endif  // V8_INTL_SUPPORT
+
+#ifndef V8_OBJECTS_JS_RELATIVE_TIME_FORMAT_H_
+#define V8_OBJECTS_JS_RELATIVE_TIME_FORMAT_H_
+
+#include "src/heap/factory.h"
+#include "src/isolate.h"
+#include "src/objects.h"
+#include "unicode/uversion.h"
+
+// Has to be the last include (doesn't have include guards):
+#include "src/objects/object-macros.h"
+
+namespace U_ICU_NAMESPACE {
+class RelativeDateTimeFormatter;
+}
+
+namespace v8 {
+namespace internal {
+
+class JSRelativeTimeFormat : public JSObject {
+ public:
+  // Initializes relative time format object with properties derived from input
+  // locales and options.
+  static MaybeHandle<JSRelativeTimeFormat> InitializeRelativeTimeFormat(
+      Isolate* isolate,
+      Handle<JSRelativeTimeFormat> relative_time_format_holder,
+      Handle<Object> locales, Handle<Object> options);
+
+  static Handle<JSObject> ResolvedOptions(
+      Isolate* isolate, Handle<JSRelativeTimeFormat> format_holder);
+
+  // Unpacks formatter object from corresponding JavaScript object.
+  static icu::RelativeDateTimeFormatter* UnpackFormatter(
+      Isolate* isolate,
+      Handle<JSRelativeTimeFormat> relative_time_format_holder);
+  Handle<String> StyleAsString() const;
+  Handle<String> NumericAsString() const;
+
+  DECL_CAST(JSRelativeTimeFormat)
+
+  // RelativeTimeFormat accessors.
+  DECL_ACCESSORS(locale, String)
+  // TODO(ftang): Style requires only 3 bits and Numeric requires only 2 bits
+  // but here we're using 64 bits for each. We should fold these two fields into
+  // a single Flags field and use BIT_FIELD_ACCESSORS to access it.
+  //
+  // Style: identifying the relative time format style used.
+  //
+  // ecma402/#sec-properties-of-intl-relativetimeformat-instances
+
+  enum class Style {
+    LONG,    // Everything spelled out.
+    SHORT,   // Abbreviations used when possible.
+    NARROW,  // Use the shortest possible form.
+    COUNT
+  };
+  inline void set_style(Style style);
+  inline Style style() const;
+
+  // Numeric: identifying whether numerical descriptions are always used, or
+  // used only when no more specific version is available (e.g., "1 day ago" vs
+  // "yesterday").
+  //
+  // ecma402/#sec-properties-of-intl-relativetimeformat-instances
+  enum class Numeric {
+    ALWAYS,  // numerical descriptions are always used ("1 day ago")
+    AUTO,    // numerical descriptions are used only when no more specific
+             // version is available ("yesterday")
+    COUNT
+  };
+  inline void set_numeric(Numeric numeric);
+  inline Numeric numeric() const;
+
+  DECL_ACCESSORS(formatter, Foreign)
+  DECL_PRINTER(JSRelativeTimeFormat)
+  DECL_VERIFIER(JSRelativeTimeFormat)
+
+  // Layout description.
+  static const int kJSRelativeTimeFormatOffset = JSObject::kHeaderSize;
+  static const int kLocaleOffset = kJSRelativeTimeFormatOffset + kPointerSize;
+  static const int kStyleOffset = kLocaleOffset + kPointerSize;
+  static const int kNumericOffset = kStyleOffset + kPointerSize;
+  static const int kFormatterOffset = kNumericOffset + kPointerSize;
+  static const int kSize = kFormatterOffset + kPointerSize;
+
+  // Constant to access field
+  static const int kFormatterField = 3;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(JSRelativeTimeFormat);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#include "src/objects/object-macros-undef.h"
+
+#endif  // V8_OBJECTS_JS_RELATIVE_TIME_FORMAT_H_