febf6795f6
Change-Id: Ibef0f650ce66030f28b59e4818f549d86415e2d1 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/143198 Tested-by: Jenkins Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
123 lines
4 KiB
C++
123 lines
4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#include <sal/config.h>
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#include <sal/types.h>
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#include <comphelper/comphelperdllapi.h>
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#include <cassert>
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namespace comphelper::date
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{
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/** Days until start of year from zero, so month and day of month can be added.
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year 1 => 0 days, year 2 => 365 days, ...
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year -1 => -366 days, year -2 => -731 days, ...
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@param nYear
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MUST be != 0.
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*/
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constexpr inline sal_Int32 YearToDays(sal_Int16 nYear)
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{
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assert(nYear != 0);
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auto val = [](int off, int y) { return off + y * 365 + y / 4 - y / 100 + y / 400; };
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return nYear < 0 ? val(-366, nYear + 1) : val(0, nYear - 1);
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}
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/** Whether year is a leap year.
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Leap years BCE are -1, -5, -9, ...
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See
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https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar#Usage
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https://en.wikipedia.org/wiki/0_(year)#History_of_astronomical_usage
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@param nYear
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MUST be != 0.
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*/
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constexpr inline bool isLeapYear(sal_Int16 nYear)
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{
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assert(nYear != 0);
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if (nYear < 0)
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nYear = -nYear - 1;
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return (((nYear % 4) == 0) && ((nYear % 100) != 0)) || ((nYear % 400) == 0);
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}
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/** Get number of days in month of year.
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@param nYear
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MUST be != 0.
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*/
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constexpr inline sal_uInt16 getDaysInMonth(sal_uInt16 nMonth, sal_Int16 nYear)
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{
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assert(1 <= nMonth && nMonth <= 12);
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if (nMonth < 1 || 12 < nMonth)
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return 0;
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constexpr sal_uInt16 aDaysInMonth[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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sal_uInt16 n = aDaysInMonth[nMonth - 1];
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return nMonth == 2 && isLeapYear(nYear) ? n + 1 : n;
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}
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/** Obtain days from zero for a given date, without normalizing.
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nDay, nMonth, nYear MUST form a valid proleptic Gregorian calendar date.
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*/
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constexpr inline sal_Int32 convertDateToDays(sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear)
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{
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sal_Int32 nDays = YearToDays(nYear);
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for (sal_uInt16 i = 1; i < nMonth; ++i)
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nDays += getDaysInMonth(i, nYear);
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nDays += nDay;
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return nDays;
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}
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/** Obtain days from zero for a given date, with normalizing.
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nDay, nMonth, nYear may be out-of-bounds and are adjusted/normalized.
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@param nYear
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Must be != 0, unless nMonth > 12.
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*/
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COMPHELPER_DLLPUBLIC sal_Int32 convertDateToDaysNormalizing(sal_uInt16 nDay, sal_uInt16 nMonth,
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sal_Int16 nYear);
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/** Whether date is a valid date.
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*/
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COMPHELPER_DLLPUBLIC bool isValidDate(sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear);
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/** Obtain date for a days from zero value.
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*/
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COMPHELPER_DLLPUBLIC void convertDaysToDate(sal_Int32 nDays, sal_uInt16& rDay, sal_uInt16& rMonth,
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sal_Int16& rYear);
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/** Normalize date, i.e. add days or months to form a proper proleptic
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Gregorian calendar date, unless all values are 0.
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@param rYear
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Must be != 0, unless rMonth > 12.
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@return <TRUE/> if date was normalized, <FALSE/> if it was valid already
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or empty (all values 0).
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*/
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COMPHELPER_DLLPUBLIC bool normalize(sal_uInt16& rDay, sal_uInt16& rMonth, sal_Int16& rYear);
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} // namespace comphelper::date
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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