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test_DateTime.cxx
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test_DateTime.cxx
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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
*/
/*!
\file
\ingroup test
\ingroup date_time
\brief A simple program to test the date-time conversions
\author Kris Thielemans
*/
#include "stir/RunTests.h"
#include "stir/date_time_functions.h"
#include "stir/error.h"
#include <iostream>
START_NAMESPACE_STIR
/*!
\brief Class with tests for date time functions
\ingroup test
\ingroup date_time
*/
class DateTimeTest : public RunTests
{
void check_round_trip(const double secs, const double tz_offset, const std::string& str);
public:
void run_tests() override;
};
void
DateTimeTest::run_tests()
{
// just do a consistency check first: mktime and local time should be "inverse" of eachother
{
time_t current_time = time(0);
struct tm* local_time = localtime(¤t_time);
if (difftime(current_time, mktime(local_time)) != 0)
error("CTIME internal error");
}
std::cerr << "Testing DICOM DateTime to epoch functionality\n";
{
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch("19700101000000.00+0000") - 0., "test 1 Jan 1970 is 0");
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch("19710202000000+0000")
- (((((365 + 31 + 1) * 24) + 0) * 60. + 0) * 60 + 0),
"test 2 Feb 1971 0:0:");
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch("19710202230001.80+0000")
- (((((365 + 31 + 1) * 24) + 23) * 60. + 0) * 60 + 1.80),
"test 2 Feb 1971 23:0:1.8");
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch("19710202230301+0230")
- (((((365 + 31 + 1) * 24) + 23 - 2.5) * 60. + 3) * 60 + 1),
"test 2 Feb 1971 23:03:01 +02:30");
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch("19710202230301-0500")
- (((((365 + 31 + 1) * 24) + 23 + 5) * 60. + 3) * 60 + 1),
"test 2 Feb 1971 23:03:01 -05:00");
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch(DICOM_date_time_to_DT("19710202", "230301", "-0500"))
- (((((365 + 31 + 1) * 24) + 23 + 5) * 60. + 3) * 60 + 1),
"test 2 Feb 1971 23:03:01 -05:00 (split)");
std::cerr << "\nThe next test should throw an error\n";
try
{
DICOM_datetime_to_secs_since_Unix_epoch("19710202230301+020");
check(false, "test ill-formed TZ");
}
catch (...)
{
std::cerr << "Test was ok\n";
}
// test difference, disabling warnings
check_if_zero(DICOM_datetime_to_secs_since_Unix_epoch("20700104000000.4", true)
- DICOM_datetime_to_secs_since_Unix_epoch("20700101000000", true) - (3 * 24 * 60. * 60 + 0.4),
"test difference without TZ");
}
std::cerr << "\nTesting Interfile DateTime to epoch functionality\n";
{
check_if_zero(Interfile_datetime_to_secs_since_Unix_epoch(DateTimeStrings("1970:01:01", "00:00:00.00+0000")) - 0.,
"test 1 Jan 1970 is 0");
check_if_zero(Interfile_datetime_to_secs_since_Unix_epoch(DateTimeStrings("1971:02:02", "00:00:00+0000"))
- (((((365 + 31 + 1) * 24) + 0) * 60. + 0) * 60 + 0),
"test 2 Feb 1971 0:0:");
check_if_zero(Interfile_datetime_to_secs_since_Unix_epoch(DateTimeStrings("1971:02:02", "23:00:01.80+0000"))
- (((((365 + 31 + 1) * 24) + 23) * 60. + 0) * 60 + 1.80),
"test 2 Feb 1971 23:0:1.8");
check_if_zero(Interfile_datetime_to_secs_since_Unix_epoch(DateTimeStrings("1971:02:02", "23:03:01+0230"))
- (((((365 + 31 + 1) * 24) + 23 - 2.5) * 60. + 3) * 60 + 1),
"test 2 Feb 1971 23:03:01 +02:30");
check_if_zero(Interfile_datetime_to_secs_since_Unix_epoch(DateTimeStrings("1971:02:02", "23:03:01-0500"))
- (((((365 + 31 + 1) * 24) + 23 + 5) * 60. + 3) * 60 + 1),
"test 2 Feb 1971 23:03:01 -05:00");
std::cerr << "\nThe next test should throw an error\n";
try
{
Interfile_datetime_to_secs_since_Unix_epoch(DateTimeStrings("1971:02:2", "23:03:01"));
check(false, "test ill-formed date");
}
catch (...)
{
std::cerr << "Test was ok\n";
}
}
std::cerr << "\nTesting round-trip\n";
{
// a time in November
double secs;
secs = DICOM_datetime_to_secs_since_Unix_epoch("20201120223001.5+0000");
check_round_trip(secs, 0., "round-trip 1 tz+0");
check_round_trip(secs, 5.5 * 3600., "round-trip 1 tz+5.5");
check_round_trip(secs, 12 * 3600., "round-trip 1 tz+12");
check_round_trip(secs, -12 * 3600., "round-trip 1 tz-12");
// a time in July (opposite DST situation)
secs = DICOM_datetime_to_secs_since_Unix_epoch("20200720235901.5+0000");
check_round_trip(secs, 0., "round-trip 2 tz+0");
check_round_trip(secs, 5.5 * 3600., "round-trip 2 tz+5.5");
check_round_trip(secs, 12 * 3600., "round-trip 2 tz+12");
check_round_trip(secs, -12 * 3600., "round-trip 2 tz-12");
}
std::cerr << "\nCurrent timezone offset in hours (I cannot check this though):\n"
<< " without DST: " << time_zone_offset_in_secs() / 3600.
<< " with DST: " << current_time_zone_and_DST_offset_in_secs() / 3600. << "\n";
}
void
DateTimeTest::check_round_trip(const double secs, const double tz_offset, const std::string& str)
{
try
{
{
const std::string time = secs_since_Unix_epoch_to_DICOM_datetime(secs, tz_offset);
const double new_secs = DICOM_datetime_to_secs_since_Unix_epoch(time);
check_if_zero(new_secs - secs, str + " : " + time);
}
{
const DateTimeStrings dt = secs_since_Unix_epoch_to_Interfile_datetime(secs, tz_offset);
const double new_secs = Interfile_datetime_to_secs_since_Unix_epoch(dt);
check_if_zero(new_secs - secs, str + " : " + dt.date + ", " + dt.time);
}
}
catch (...)
{
check(false, str);
}
}
END_NAMESPACE_STIR
USING_NAMESPACE_STIR
int
main()
{
DateTimeTest tests;
tests.run_tests();
return tests.main_return_value();
}