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diff --git a/js/src/builtin/intl/DateTimeFormat.h b/js/src/builtin/intl/DateTimeFormat.h
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+++ b/js/src/builtin/intl/DateTimeFormat.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef builtin_intl_DateTimeFormat_h
+#define builtin_intl_DateTimeFormat_h
+
+#include "mozilla/Attributes.h"
+
+#include "builtin/intl/CommonFunctions.h"
+#include "builtin/SelfHostingDefines.h"
+#include "js/Class.h"
+#include "js/RootingAPI.h"
+#include "vm/NativeObject.h"
+
+using UDateFormat = void*;
+struct UDateIntervalFormat;
+
+namespace js {
+
+class DateTimeFormatObject : public NativeObject {
+ public:
+  static const JSClass class_;
+  static const JSClass& protoClass_;
+
+  static constexpr uint32_t INTERNALS_SLOT = 0;
+  static constexpr uint32_t UDATE_FORMAT_SLOT = 1;
+  static constexpr uint32_t UDATE_INTERVAL_FORMAT_SLOT = 2;
+  static constexpr uint32_t SLOT_COUNT = 3;
+
+  static_assert(INTERNALS_SLOT == INTL_INTERNALS_OBJECT_SLOT,
+                "INTERNALS_SLOT must match self-hosting define for internals "
+                "object slot");
+
+  // Estimated memory use for UDateFormat (see IcuMemoryUsage).
+  static constexpr size_t UDateFormatEstimatedMemoryUse = 91922;
+
+  // Estimated memory use for UDateIntervalFormat (see IcuMemoryUsage).
+  static constexpr size_t UDateIntervalFormatEstimatedMemoryUse = 119856;
+
+  UDateFormat* getDateFormat() const {
+    const auto& slot = getFixedSlot(UDATE_FORMAT_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<UDateFormat*>(slot.toPrivate());
+  }
+
+  void setDateFormat(UDateFormat* dateFormat) {
+    setFixedSlot(UDATE_FORMAT_SLOT, PrivateValue(dateFormat));
+  }
+
+  UDateIntervalFormat* getDateIntervalFormat() const {
+    const auto& slot = getFixedSlot(UDATE_INTERVAL_FORMAT_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<UDateIntervalFormat*>(slot.toPrivate());
+  }
+
+  void setDateIntervalFormat(UDateIntervalFormat* dateIntervalFormat) {
+    setFixedSlot(UDATE_INTERVAL_FORMAT_SLOT, PrivateValue(dateIntervalFormat));
+  }
+
+ private:
+  static const JSClassOps classOps_;
+  static const ClassSpec classSpec_;
+
+  static void finalize(JSFreeOp* fop, JSObject* obj);
+};
+
+/**
+ * Returns a new instance of the standard built-in DateTimeFormat constructor.
+ * Self-hosted code cannot cache this constructor (as it does for others in
+ * Utilities.js) because it is initialized after self-hosted code is compiled.
+ *
+ * Usage: dateTimeFormat = intl_DateTimeFormat(locales, options)
+ */
+extern MOZ_MUST_USE bool intl_DateTimeFormat(JSContext* cx, unsigned argc,
+                                             JS::Value* vp);
+
+/**
+ * Returns an array with the calendar type identifiers per Unicode
+ * Technical Standard 35, Unicode Locale Data Markup Language, for the
+ * supported calendars for the given locale. The default calendar is
+ * element 0.
+ *
+ * Usage: calendars = intl_availableCalendars(locale)
+ */
+extern MOZ_MUST_USE bool intl_availableCalendars(JSContext* cx, unsigned argc,
+                                                 JS::Value* vp);
+
+/**
+ * Returns the calendar type identifier per Unicode Technical Standard 35,
+ * Unicode Locale Data Markup Language, for the default calendar for the given
+ * locale.
+ *
+ * Usage: calendar = intl_defaultCalendar(locale)
+ */
+extern MOZ_MUST_USE bool intl_defaultCalendar(JSContext* cx, unsigned argc,
+                                              JS::Value* vp);
+
+/**
+ * 6.4.1 IsValidTimeZoneName ( timeZone )
+ *
+ * Verifies that the given string is a valid time zone name. If it is a valid
+ * time zone name, its IANA time zone name is returned. Otherwise returns null.
+ *
+ * ES2017 Intl draft rev 4a23f407336d382ed5e3471200c690c9b020b5f3
+ *
+ * Usage: ianaTimeZone = intl_IsValidTimeZoneName(timeZone)
+ */
+extern MOZ_MUST_USE bool intl_IsValidTimeZoneName(JSContext* cx, unsigned argc,
+                                                  JS::Value* vp);
+
+/**
+ * Return the canonicalized time zone name. Canonicalization resolves link
+ * names to their target time zones.
+ *
+ * Usage: ianaTimeZone = intl_canonicalizeTimeZone(timeZone)
+ */
+extern MOZ_MUST_USE bool intl_canonicalizeTimeZone(JSContext* cx, unsigned argc,
+                                                   JS::Value* vp);
+
+/**
+ * Return the default time zone name. The time zone name is not canonicalized.
+ *
+ * Usage: icuDefaultTimeZone = intl_defaultTimeZone()
+ */
+extern MOZ_MUST_USE bool intl_defaultTimeZone(JSContext* cx, unsigned argc,
+                                              JS::Value* vp);
+
+/**
+ * Return the raw offset from GMT in milliseconds for the default time zone.
+ *
+ * Usage: defaultTimeZoneOffset = intl_defaultTimeZoneOffset()
+ */
+extern MOZ_MUST_USE bool intl_defaultTimeZoneOffset(JSContext* cx,
+                                                    unsigned argc,
+                                                    JS::Value* vp);
+
+/**
+ * Return true if the given string is the default time zone as returned by
+ * intl_defaultTimeZone(). Otherwise return false.
+ *
+ * Usage: isIcuDefaultTimeZone = intl_isDefaultTimeZone(icuDefaultTimeZone)
+ */
+extern MOZ_MUST_USE bool intl_isDefaultTimeZone(JSContext* cx, unsigned argc,
+                                                JS::Value* vp);
+
+/**
+ * Return a pattern in the date-time format pattern language of Unicode
+ * Technical Standard 35, Unicode Locale Data Markup Language, for the
+ * best-fit date-time format pattern corresponding to skeleton for the
+ * given locale.
+ *
+ * Usage: pattern = intl_patternForSkeleton(locale, skeleton, hourCycle)
+ */
+extern MOZ_MUST_USE bool intl_patternForSkeleton(JSContext* cx, unsigned argc,
+                                                 JS::Value* vp);
+
+/**
+ * Return a pattern in the date-time format pattern language of Unicode
+ * Technical Standard 35, Unicode Locale Data Markup Language, for the
+ * best-fit date-time style for the given locale.
+ * The function takes six arguments:
+ *
+ *   locale
+ *     BCP47 compliant locale string
+ *   dateStyle
+ *     A string with values: full or long or medium or short, or `undefined`
+ *   timeStyle
+ *     A string with values: full or long or medium or short, or `undefined`
+ *   timeZone
+ *     IANA time zone name
+ *   hour12
+ *     A boolean to request hour12 representation, or `undefined`
+ *   hourCycle
+ *     A string with values: h11, h12, h23, or h24, or `undefined`
+ *
+ * Date and time style categories map to CLDR time/date standard
+ * format patterns.
+ *
+ * For the definition of a pattern string, see LDML 4.8:
+ * http://unicode.org/reports/tr35/tr35-dates.html#Date_Format_Patterns
+ *
+ * If `undefined` is passed to `dateStyle` or `timeStyle`, the respective
+ * portions of the pattern will not be included in the result.
+ *
+ * Usage: pattern = intl_patternForStyle(locale, dateStyle, timeStyle, timeZone,
+ *                                       hour12, hourCycle)
+ */
+extern MOZ_MUST_USE bool intl_patternForStyle(JSContext* cx, unsigned argc,
+                                              JS::Value* vp);
+
+/**
+ * Return a skeleton for the pattern in the date-time format pattern language of
+ * Unicode Technical Standard 35, Unicode Locale Data Markup Language.
+ *
+ * Usage: skeleton = intl_skeletonForPattern(pattern)
+ */
+extern MOZ_MUST_USE bool intl_skeletonForPattern(JSContext* cx, unsigned argc,
+                                                 JS::Value* vp);
+
+/**
+ * Returns a String value representing x (which must be a Number value)
+ * according to the effective locale and the formatting options of the
+ * given DateTimeFormat.
+ *
+ * Spec: ECMAScript Internationalization API Specification, 12.3.2.
+ *
+ * Usage: formatted = intl_FormatDateTime(dateTimeFormat, x, formatToParts)
+ */
+extern MOZ_MUST_USE bool intl_FormatDateTime(JSContext* cx, unsigned argc,
+                                             JS::Value* vp);
+
+/**
+ * Returns a String value representing the range between x and y (which both
+ * must be Number values) according to the effective locale and the formatting
+ * options of the given DateTimeFormat.
+ *
+ * Spec: Intl.DateTimeFormat.prototype.formatRange proposal
+ *
+ * Usage: formatted = intl_FormatDateTimeRange(dateTimeFmt, x, y, formatToParts)
+ */
+extern MOZ_MUST_USE bool intl_FormatDateTimeRange(JSContext* cx, unsigned argc,
+                                                  JS::Value* vp);
+
+}  // namespace js
+
+#endif /* builtin_intl_DateTimeFormat_h */