date_time_functions.h

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/*
    Copyright (C) 2020, University College London
    This file is part of STIR.

    SPDX-License-Identifier: Apache-2.0

    See STIR/LICENSE.txt for details
*/

#ifndef __date_time_functions_H__
#define __date_time_functions_H__

#include "stir/common.h"
#include <string>

START_NAMESPACE_STIR

int time_zone_offset_in_secs();

int current_time_zone_and_DST_offset_in_secs();

std::string DICOM_date_time_to_DT(const std::string& date, const std::string& time, const std::string& TZ = "");

double DICOM_datetime_to_secs_since_Unix_epoch(const std::string& str, bool silent = false);

std::string secs_since_Unix_epoch_to_DICOM_datetime(double secs,
                                                    int time_zone_offset_in_secs = current_time_zone_and_DST_offset_in_secs());

struct DateTimeStrings
{
  DateTimeStrings() {}
  DateTimeStrings(const std::string& date, const std::string& time)
      : date(date),
        time(time)
  {}

  std::string date, time;
};


DateTimeStrings DICOM_datetime_to_Interfile(const std::string& str);


std::string Interfile_datetime_to_DICOM(const DateTimeStrings&);

double Interfile_datetime_to_secs_since_Unix_epoch(const DateTimeStrings&, bool silent = false);

DateTimeStrings secs_since_Unix_epoch_to_Interfile_datetime(double secs,
                                                            int time_zone_offset_in_secs
                                                            = current_time_zone_and_DST_offset_in_secs());

END_NAMESPACE_STIR

#endif // __date_time_functions_H__