/**
 * \file
 * \author Karsten Rink
 * \date   2010-01-22
 * \brief  Definition of date helper functions.
 *
 * \copyright
 * Copyright (c) 2012-2021, OpenGeoSys Community (http://www.opengeosys.org)
 *            Distributed under a Modified BSD License.
 *              See accompanying file LICENSE.txt or
 *              http://www.opengeosys.org/project/license
 *
 */

#pragma once

#include <chrono>
#include <string>

namespace BaseLib
{

/**
 * Converts three integers representing a date into a double.
 * Note: It is not really checked if the date actually makes sense.
 */
int date2int(int y, int m, int d);

/**
 * Converts an integer to a string date "dd.mm.yyyy"
 * Note: (Almost) no checks are performed if the int makes sense as a date.
 */
std::string int2date(int date);

/**
 * Converts a double representing a date into a string.
 * Note: It is not really checked if the date actually makes sense.
 * \param ddate Number containing date in double format yyyymmdd
 * \return A string containing the date in format "dd.mm.yyyy".
 */
std::string date2string(double ddate);

/**
 * Converts a string containing a date into a double.
 * Note: It is not really checked if the date actually makes sense.
 * \param s String containing the date, the expected format is "dd.mm.yyyy".
 * \return A number representing the date as dd.mm.yyyy.
 */
int strDate2int(const std::string &s);

/**
 * Converts a string containing a date into a double.
 * Note: It is not really checked if the date actually makes sense.
 * \param s String containing the date, the expected format is conform to the xml date type, i.e. "yyyy-mm-dd".
 * \return A number representing the date as yyyymmdd.
 */
int xmlDate2int(const std::string &s);

/**
 * Formats the given time point according to RFC 3339 (cf. man-page of the unix
 * date utility).
 *
 * Example: 2006-08-14 02:34:56-06:00
 */
std::string formatDate(
    std::chrono::time_point<std::chrono::system_clock> const& time);

} // namespace BaseLib