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diff --git a/Userland/Libraries/LibJS/Runtime/Date.h b/Userland/Libraries/LibJS/Runtime/Date.h
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+/*
+ * Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibCore/DateTime.h>
+#include <LibJS/Runtime/Object.h>
+
+namespace JS {
+
+class Date final : public Object {
+    JS_OBJECT(Date, Object);
+
+public:
+    static Date* create(GlobalObject&, Core::DateTime, u16 milliseconds);
+
+    Date(Core::DateTime datetime, u16 milliseconds, Object& prototype);
+    virtual ~Date() override;
+
+    Core::DateTime& datetime() { return m_datetime; }
+    const Core::DateTime& datetime() const { return m_datetime; }
+
+    int date() const { return datetime().day(); }
+    int day() const { return datetime().weekday(); }
+    int full_year() const { return datetime().year(); }
+    int hours() const { return datetime().hour(); }
+    u16 milliseconds() const { return m_milliseconds; }
+    int minutes() const { return datetime().minute(); }
+    int month() const { return datetime().month() - 1; }
+    int seconds() const { return datetime().second(); }
+    double time() const { return datetime().timestamp() * 1000.0 + milliseconds(); }
+    int year() const { return datetime().day(); }
+
+    int utc_date() const;
+    int utc_day() const;
+    int utc_full_year() const;
+    int utc_hours() const;
+    int utc_milliseconds() const { return milliseconds(); }
+    int utc_minutes() const;
+    int utc_month() const;
+    int utc_seconds() const;
+
+    String date_string() const { return m_datetime.to_string("%a %b %d %Y"); }
+    // FIXME: Deal with timezones once SerenityOS has a working tzset(3)
+    String time_string() const { return m_datetime.to_string("%T GMT+0000 (UTC)"); }
+    String string() const
+    {
+        return String::formatted("{} {}", date_string(), time_string());
+    }
+
+    String iso_date_string() const;
+
+    // FIXME: One day, implement real locale support. Until then, everyone gets what the Clock MenuApplet displays.
+    String locale_date_string() const { return m_datetime.to_string("%Y-%m-%d"); }
+    String locale_string() const { return m_datetime.to_string(); }
+    String locale_time_string() const { return m_datetime.to_string("%H:%M:%S"); }
+
+    virtual Value value_of() const override
+    {
+        return Value(static_cast<double>(m_datetime.timestamp() * 1000 + m_milliseconds));
+    }
+
+private:
+    tm to_utc_tm() const;
+
+    Core::DateTime m_datetime;
+    u16 m_milliseconds;
+};
+
+}