Revert "Move files in wtf/ to platform/wtf/"

third_party/WebKit/Source/wtf/DateMath.h

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
+/*
+ * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2010 Research In Motion Limited. All rights reserved.
+ *
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ */
 
-#include "platform/wtf/DateMath.h"
+#ifndef DateMath_h
+#define DateMath_h
 
-// The contents of this header was moved to platform/wtf as part of
-// WTF migration project. See the following post for details:
-// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ
+#include "wtf/WTFExport.h"
+#include "wtf/text/WTFString.h"
+#include <stdint.h>
+#include <string.h>
+
+namespace WTF {
+
+WTF_EXPORT void initializeDates();
+
+// Not really math related, but this is currently the only shared place to put
+// these.
+WTF_EXPORT double parseDateFromNullTerminatedCharacters(const char* dateString);
+// dayOfWeek: [0, 6] 0 being Monday
+// day: [1, 31]
+// month: [0, 11]
+// year: ex: 2011
+// hours: [0, 23]
+// minutes: [0, 59]
+// seconds: [0, 59]
+// utcOffset: [-720,720].
+WTF_EXPORT String makeRFC2822DateString(unsigned dayOfWeek,
+                                        unsigned day,
+                                        unsigned month,
+                                        unsigned year,
+                                        unsigned hours,
+                                        unsigned minutes,
+                                        unsigned seconds,
+                                        int utcOffset);
+
+const char weekdayName[7][4] = {"Mon", "Tue", "Wed", "Thu",
+                                "Fri", "Sat", "Sun"};
+const char monthName[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+                               "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+const char* const monthFullName[12] = {
+    "January", "February", "March",     "April",   "May",      "June",
+    "July",    "August",   "September", "October", "November", "December"};
+
+const double minutesPerHour = 60.0;
+const double secondsPerMinute = 60.0;
+const double msPerSecond = 1000.0;
+const double msPerMinute = 60.0 * 1000.0;
+const double msPerHour = 60.0 * 60.0 * 1000.0;
+const double msPerDay = 24.0 * 60.0 * 60.0 * 1000.0;
+
+WTF_EXPORT bool isLeapYear(int year);
+
+// Returns the number of days from 1970-01-01 to the specified date.
+WTF_EXPORT double dateToDaysFrom1970(int year, int month, int day);
+WTF_EXPORT int msToYear(double ms);
+WTF_EXPORT int dayInYear(int year, int month, int day);
+WTF_EXPORT int dayInYear(double ms, int year);
+WTF_EXPORT int monthFromDayInYear(int dayInYear, bool leapYear);
+WTF_EXPORT int dayInMonthFromDayInYear(int dayInYear, bool leapYear);
+
+// Returns milliseconds with UTC and DST.
+WTF_EXPORT double convertToLocalTime(double ms);
+
+}  // namespace WTF
+
+using WTF::isLeapYear;
+using WTF::dateToDaysFrom1970;
+using WTF::dayInMonthFromDayInYear;
+using WTF::dayInYear;
+using WTF::minutesPerHour;
+using WTF::monthFromDayInYear;
+using WTF::msPerDay;
+using WTF::msPerHour;
+using WTF::msPerMinute;
+using WTF::msPerSecond;
+using WTF::msToYear;
+using WTF::secondsPerMinute;
+using WTF::parseDateFromNullTerminatedCharacters;
+using WTF::makeRFC2822DateString;
+using WTF::convertToLocalTime;
+
+#endif  // DateMath_h