date_time_tester.cc

// Hossein Moein
// March 18, 2018
/*
Copyright (c) 2019-2022, Hossein Moein
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.
* Neither the name of Hossein Moein and/or the DataFrame nor the
  names of its contributors may be used to endorse or promote products
  derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL Hossein Moein BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <DataFrame/Utils/DateTime.h>
#include <DataFrame/Utils/FixedSizeString.h>

#include <cassert>
#include <cstdlib>
#include <iostream>
#include <string>

using namespace hmdf;

// ----------------------------------------------------------------------------

int main (int argc, char *argv [])  {

    using namespace std;

    String1K   tstr;

    DateTime    now;
    DateTime    gmnow (DT_TIME_ZONE::GMT);

    cout << "Local Time is: " << now.string_format (DT_FORMAT::DT_TM2)
         << "   Nanoseconds: " << now.nanosec () << endl;
    cout << "GMT Time is: " << gmnow.string_format (DT_FORMAT::DT_TM2)
         << "   Microseconds: " << now.microsec () << endl;

    now = 19721202;
    assert(now.string_format (DT_FORMAT::DT_TM2) == "12/02/1972 00:00:00.000");
    now = "19910223 16:23:45.230";
    assert(now.string_format (DT_FORMAT::DT_TM2) == "02/23/1991 16:23:45.230");
    now = "19910223 16:23:45.230";
    assert(now.string_format (DT_FORMAT::DT_TM2) == "02/23/1991 16:23:45.230");
    now = "20100207 12";
    assert(now.string_format (DT_FORMAT::DT_TM2) == "02/07/2010 12:00:00.000");
    now = "20100207 12:32";
    assert(now.string_format (DT_FORMAT::DT_TM2) == "02/07/2010 12:32:00.000");
    now = "20100207 12:32:12";

    try  {
        long  diff = static_cast<long> (now.diff_seconds (gmnow));

        assert(false);
    }
    catch (const std::runtime_error &)  {
        // cout << ex.what();
        ; // Time diff between different timezones is not implemented
    }

    {
        // Testing DateTime's add_days()

        DateTime    now (20181023, 10, 24, 1, 123456789);

        assert(now.string_format(DT_FORMAT::DT_TM2) ==
                   "10/23/2018 10:24:01.123");
        now.add_days (1);
        assert(now.string_format(DT_FORMAT::DT_TM2) ==
                   "10/24/2018 10:24:01.123");
        now.add_days (-1);
        assert(now.string_format(DT_FORMAT::DT_TM2) ==
                   "10/23/2018 10:24:01.123");

        now.add_weekdays (1);
        assert(now.string_format(DT_FORMAT::DT_TM2) ==
                   "10/24/2018 10:24:01.123");
        now.add_weekdays (-1);
        assert(now.string_format(DT_FORMAT::DT_TM2) ==
                   "10/23/2018 10:24:01.123");

        {
            DateTime    dt (20091224, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/28/2009 09:30:00.000");
        }

        {
            DateTime    dt (20081224, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/26/2008 09:30:00.000");
        }

        {
            DateTime    dt (20061224, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/26/2006 09:30:00.000");
        }

        {
            DateTime    dt (20051223, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/27/2005 09:30:00.000");
        }

        {
            DateTime    dt (20041223, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/27/2004 09:30:00.000");
        }

        {
            DateTime    dt (20001222, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/26/2000 09:30:00.000");
        }

        {
            DateTime    dt (19981224, 9, 30);

            dt.add_weekdays (2);
            assert(dt.string_format (DT_FORMAT::DT_TM2) ==
                       "12/28/1998 09:30:00.000");
        }
    }

    {
        cout << "\n----- Testing DateTime's GMT vs Local time\n" << endl;

        DateTime    gmt_now (DT_TIME_ZONE::GMT);
        DateTime    local_now;

        DateTime    local_alt_con (local_now.date (), local_now.hour (),
                                   local_now.minute (), local_now.sec (),
                                   local_now.msec ());
        DateTime    gmt_alt_con (gmt_now.date (), gmt_now.hour (),
                                 gmt_now.minute (), gmt_now.sec (),
                                 gmt_now.msec (), DT_TIME_ZONE::GMT);

        DateTime    local_time_1970 (19700101);
        DateTime    gmt_time_1970 (19700101, 0, 0, 0, 0, DT_TIME_ZONE::GMT);

        DateTime    local_time_1989 (19891214, 20, 15, 23, 0);
        DateTime    gmt_time_1989 (19891214, 20, 15, 23, 0, DT_TIME_ZONE::GMT);

        cout << "GMT now time: " << gmt_now.string_format (DT_FORMAT::DT_TM2)
             << "   " << gmt_now.time () << endl;
        cout << "GMT ALT Constructor time: "
             << gmt_alt_con.string_format (DT_FORMAT::DT_TM2)
             << "   " << gmt_alt_con.time () << endl << endl;

        cout << "Local now time: "
             << local_now.string_format (DT_FORMAT::DT_TM2)
             << "   " << local_now.time ()  << endl;
        cout << "Local ALT Constructor time: "
             << local_alt_con.string_format (DT_FORMAT::DT_TM2)
             << "   " << local_alt_con.time () << endl << endl;

        cout << "Local 1970 ALT Constructor time: "
             << local_time_1970.string_format (DT_FORMAT::DT_TM2)
             << "   " << local_time_1970.time () << endl;
        cout << "GMT 1970 ALT Constructor time: "
             << gmt_time_1970.string_format (DT_FORMAT::DT_TM2)
             << "   " << gmt_time_1970.time () << endl << endl;

        cout << "Local 1989 ALT Constructor time: "
             << local_time_1989.string_format (DT_FORMAT::DT_TM2)
             << "   " << local_time_1989.time () << endl;
        cout << "GMT 1989 ALT Constructor time: "
             << gmt_time_1989.string_format (DT_FORMAT::DT_TM2)
             << "   " << gmt_time_1989.time () << endl << endl;
    }

    {
        cout << "\n----- Testing DateTime's weekdays day methods\n" << endl;

        const   DateTime    new_year (20020101);

        cout << "20020101 is a US holiday: "
             << (new_year.is_us_business_day () ? "NO" : "YES") << endl;

        const   DateTime    thanksgiving (20011122);

        cout << "20011122 (Thanksgiving) is a US holiday: "
             << (thanksgiving.is_us_business_day () ? "NO" : "YES") << endl;

        DateTime            yes_answers [80];
        int                 i = 0;
        const   DateTime    hol01 (19980101);  yes_answers [i++] = hol01;
        const   DateTime    hol02 (19980119);  yes_answers [i++] = hol02;
        const   DateTime    hol03 (19980216);  yes_answers [i++] = hol03;
        const   DateTime    hol04 (19980525);  yes_answers [i++] = hol04;
        const   DateTime    hol05 (19980703);  yes_answers [i++] = hol05;
        const   DateTime    hol06 (19980907);  yes_answers [i++] = hol06;
        const   DateTime    hol07 (19981126);  yes_answers [i++] = hol07;
        const   DateTime    hol08 (19981225);  yes_answers [i++] = hol08;
        const   DateTime    hol09 (19990101);  yes_answers [i++] = hol09;
        const   DateTime    hol10 (19990118);  yes_answers [i++] = hol10;
        const   DateTime    hol11 (19990215);  yes_answers [i++] = hol11;
        const   DateTime    hol12 (19990531);  yes_answers [i++] = hol12;
        const   DateTime    hol13 (19990705);  yes_answers [i++] = hol13;
        const   DateTime    hol14 (19990906);  yes_answers [i++] = hol14;
        const   DateTime    hol15 (19991125);  yes_answers [i++] = hol15;
        const   DateTime    hol16 (19991224);  yes_answers [i++] = hol16;
        const   DateTime    hol17 (19991231);  yes_answers [i++] = hol17;
        const   DateTime    hol18 (20000117);  yes_answers [i++] = hol18;
        const   DateTime    hol19 (20000221);  yes_answers [i++] = hol19;
        const   DateTime    hol20 (20000529);  yes_answers [i++] = hol20;
        const   DateTime    hol21 (20000704);  yes_answers [i++] = hol21;
        const   DateTime    hol22 (20000904);  yes_answers [i++] = hol22;
        const   DateTime    hol23 (20001123);  yes_answers [i++] = hol23;
        const   DateTime    hol24 (20001225);  yes_answers [i++] = hol24;
        const   DateTime    hol25 (20010101);  yes_answers [i++] = hol25;
        const   DateTime    hol26 (20010115);  yes_answers [i++] = hol26;
        const   DateTime    hol27 (20010219);  yes_answers [i++] = hol27;
        const   DateTime    hol28 (20010528);  yes_answers [i++] = hol28;
        const   DateTime    hol29 (20010704);  yes_answers [i++] = hol29;
        const   DateTime    hol30 (20010903);  yes_answers [i++] = hol30;
        const   DateTime    hol31 (20011122);  yes_answers [i++] = hol31;
        const   DateTime    hol32 (20011225);  yes_answers [i++] = hol32;
        const   DateTime    hol33 (20020101);  yes_answers [i++] = hol33;
        const   DateTime    hol34 (20020121);  yes_answers [i++] = hol34;
        const   DateTime    hol35 (20020218);  yes_answers [i++] = hol35;
        const   DateTime    hol36 (20020527);  yes_answers [i++] = hol36;
        const   DateTime    hol37 (20020704);  yes_answers [i++] = hol37;
        const   DateTime    hol38 (20020902);  yes_answers [i++] = hol38;
        const   DateTime    hol39 (20021128);  yes_answers [i++] = hol39;
        const   DateTime    hol40 (20021225);  yes_answers [i++] = hol40;
        const   DateTime    hol41 (20030101);  yes_answers [i++] = hol41;
        const   DateTime    hol42 (20030120);  yes_answers [i++] = hol42;
        const   DateTime    hol43 (20030217);  yes_answers [i++] = hol43;
        const   DateTime    hol44 (20030526);  yes_answers [i++] = hol44;
        const   DateTime    hol45 (20030704);  yes_answers [i++] = hol45;
        const   DateTime    hol46 (20030901);  yes_answers [i++] = hol46;
        const   DateTime    hol47 (20031127);  yes_answers [i++] = hol47;
        const   DateTime    hol48 (20031225);  yes_answers [i++] = hol48;
        const   DateTime    hol49 (20040101);  yes_answers [i++] = hol49;
        const   DateTime    hol50 (20040119);  yes_answers [i++] = hol50;
        const   DateTime    hol51 (20040216);  yes_answers [i++] = hol51;
        const   DateTime    hol52 (20040531);  yes_answers [i++] = hol52;
        const   DateTime    hol53 (20040705);  yes_answers [i++] = hol53;
        const   DateTime    hol54 (20040906);  yes_answers [i++] = hol54;
        const   DateTime    hol55 (20041125);  yes_answers [i++] = hol55;
        const   DateTime    hol56 (20041224);  yes_answers [i++] = hol56;
        const   DateTime    hol57 (20041231);  yes_answers [i++] = hol57;
        const   DateTime    hol58 (20050117);  yes_answers [i++] = hol58;
        const   DateTime    hol59 (20050221);  yes_answers [i++] = hol59;
        const   DateTime    hol60 (20050530);  yes_answers [i++] = hol60;
        const   DateTime    hol61 (20050704);  yes_answers [i++] = hol61;
        const   DateTime    hol62 (20050905);  yes_answers [i++] = hol62;
        const   DateTime    hol63 (20051124);  yes_answers [i++] = hol63;
        const   DateTime    hol64 (20051226);  yes_answers [i++] = hol64;
        const   DateTime    hol65 (20060102);  yes_answers [i++] = hol65;
        const   DateTime    hol66 (20060116);  yes_answers [i++] = hol66;
        const   DateTime    hol67 (20060220);  yes_answers [i++] = hol67;
        const   DateTime    hol68 (20060529);  yes_answers [i++] = hol68;
        const   DateTime    hol69 (20060704);  yes_answers [i++] = hol69;
        const   DateTime    hol70 (20060904);  yes_answers [i++] = hol70;
        const   DateTime    hol71 (20061123);  yes_answers [i++] = hol71;
        const   DateTime    hol72 (20061225);  yes_answers [i++] = hol72;
        const   DateTime    hol73 (20070101);  yes_answers [i++] = hol73;
        const   DateTime    hol74 (20070115);  yes_answers [i++] = hol74;
        const   DateTime    hol75 (20070219);  yes_answers [i++] = hol75;
        const   DateTime    hol76 (20070528);  yes_answers [i++] = hol76;
        const   DateTime    hol77 (20070704);  yes_answers [i++] = hol77;
        const   DateTime    hol78 (20070903);  yes_answers [i++] = hol78;
        const   DateTime    hol79 (20071122);  yes_answers [i++] = hol79;
        const   DateTime    hol80 (20071225);  yes_answers [i++] = hol80;

        for (i = 0; i < 80; i++)  {
            cout << (yes_answers [i].is_us_business_day ()
                        ?  (yes_answers [i].string_format (DT_FORMAT::DT_TM2) +
                           " should be a holiday\n")
                        : "");
        }

        for (i = 0; i < 80; i++)  {
            for (int j = 0; j < 7; j++)  {
                yes_answers [i].add_days (1);
                if (! yes_answers [i].is_weekend () &&
                    ! yes_answers [i].is_us_business_day ())  {
                    cout << yes_answers [i].string_format (DT_FORMAT::DT_TM2)
                         << " may not be a holiday" << endl;
                }
            }
            yes_answers [i].add_days (-7);
            if (yes_answers [i].is_us_business_day ())  {
                cout << yes_answers [i].string_format (DT_FORMAT::DT_TM2)
                     << " should be a holiday" << endl;
            }
            for (int j = 0; j < 7; j++)  {
                yes_answers [i].add_days (-1);
                if (! yes_answers [i].is_weekend () &&
                    ! yes_answers [i].is_us_business_day ())  {
                    cout << yes_answers [i].string_format (DT_FORMAT::DT_TM2)
                         << " may not be a holiday" << endl;
                }
            }
        }

        i = 0;

        DateTime            columbus [10];
        const   DateTime    columbus01 (19981012);  columbus[i++] = columbus01;
        const   DateTime    columbus02 (19991011);  columbus[i++] = columbus02;
        const   DateTime    columbus03 (20001009);  columbus[i++] = columbus03;
        const   DateTime    columbus04 (20011008);  columbus[i++] = columbus04;
        const   DateTime    columbus05 (20021014);  columbus[i++] = columbus05;
        const   DateTime    columbus06 (20031013);  columbus[i++] = columbus06;
        const   DateTime    columbus07 (20041011);  columbus[i++] = columbus07;
        const   DateTime    columbus08 (20051010);  columbus[i++] = columbus08;
        const   DateTime    columbus09 (20061009);  columbus[i++] = columbus09;
        const   DateTime    columbus10 (20071008);  columbus[i++] = columbus10;

        for (i = 0; i < 10; i++)  {
            cout << (columbus [i].is_us_bank_holiday ()
                        ? ""
                        : (columbus [i].string_format (DT_FORMAT::DT_TM2) +
                          " should be a bank holiday\n"));
            cout << (columbus [i].is_us_business_day ()
                        ? ""
                        : (columbus [i].string_format (DT_FORMAT::DT_TM2) +
                          " should not be a regular holiday\n"));
        }
        for (i = 0; i < 10; i++)  {
            for (int j = 0; j < 7; j++)  {
                columbus [i].add_days (1);
                if (! columbus [i].is_weekend () &&
                    columbus [i].is_us_bank_holiday ())  {
                    cout << columbus [i].string_format (DT_FORMAT::DT_TM2)
                         << " should not be a bank holiday" << endl;
                }
                if (! columbus [i].is_weekend () &&
                    ! columbus [i].is_us_business_day ())  {
                    cout << columbus [i].string_format (DT_FORMAT::DT_TM2)
                         << " may not be a holiday" << endl;
                }
            }
            columbus [i].add_days (-7);
            if (! columbus [i].is_us_bank_holiday ())  {
                cout << columbus [i].string_format (DT_FORMAT::DT_TM2)
                     << " should be a regular holiday" << endl;
            }
            if (! columbus [i].is_us_business_day ())  {
                cout << columbus [i].string_format (DT_FORMAT::DT_TM2)
                     << " should not be a regular holiday" << endl;
            }
            for (int j = 0; j < 7; j++)  {
                columbus [i].add_days (-1);
                if (! columbus [i].is_weekend () &&
                    columbus [i].is_us_bank_holiday ())  {
                    cout << columbus [i].string_format (DT_FORMAT::DT_TM2)
                         << " should not be a bank holiday" << endl;
                }
                if (! columbus [i].is_weekend () &&
                    ! columbus [i].is_us_business_day ())  {
                    cout << columbus [i].string_format (DT_FORMAT::DT_TM2)
                         << " may not be a holiday" << endl;
                }
            }
        }
    }

    cout << "\n----- Testing DateTime's diff methods\n" << endl;

    {
        const   DateTime    dt1 (20020101, 12, 54, 31);
        const   DateTime    dt2 (20020201, 3, 50, 30);

        cout << "dt1 is: " << dt1.string_format (DT_FORMAT::DT_TM2) << endl;
        cout << "dt2 is: " << dt2.string_format (DT_FORMAT::DT_TM2) << endl;
        cout << "second difference between dt1 and dt2: "
             << dt1.diff_seconds (dt2) << endl;
        cout << "minute difference between dt1 and dt2: "
             << dt1.diff_minutes (dt2) << endl;
        cout << "hour difference between dt1 and dt2: "
             << dt1.diff_hours (dt2) << endl;
        cout << "day difference between dt1 and dt2: "
             << dt1.diff_days (dt2) << endl;
        cout << "business day difference between dt1 and dt2: "
             << dt1.diff_weekdays (dt2) << endl;
        cout << "week difference between dt1 and dt2: "
             << dt1.diff_weeks (dt2) << endl;

        size_t          index = 0;
        const   size_t  max_index = 10000;
        DateTime        now_performance (19700101);

        while (++index < max_index)  {
            now_performance.add_weekdays (1);
        }

        cout << "After adding " << max_index << " weekdays days to 19700101, "
             << "the date is "
             << now_performance.string_format (DT_FORMAT::DT_TM2)
             << endl;
    }

    cout << "\n----- Testing DateTime's DST vs EST (Going Forward)\n" << endl;
    {
        {
            DateTime    start (20060331);
            DateTime    test;
            int         i = 0;

            cout << "\tGoing from EST to DST\n" << endl;
            while (i++ <= 10)  {
                test = start;
                cout << test.string_format (DT_FORMAT::DT_TM2)
                     << " --- " << test.time () << endl;
                start.add_days (1);
            }
        }

        {
            DateTime    start (20051028);
            DateTime    test;
            int         i = 0;

            cout << endl << endl;
            cout << "\tGoing from DST to EST\n" << endl;
            while (i++ <= 10)  {
                test = start;
                cout << test.string_format (DT_FORMAT::DT_TM2)
                     << " --- " << test.time () << endl;
                start.add_days (1);
            }
        }

        {
            DateTime    start (20060331);

            cout << endl << endl;
            cout << "\tGoing from EST to DST in one shot\n" << endl;

            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
            start.add_days (10);
            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
        }

        {
            DateTime    start (20051028);

            cout << endl << endl;
            cout << "\tGoing from DST to EST in one shot\n" << endl;

            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
            start.add_days (10);
            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
        }
    }


    cout << "\n----- Testing DateTime's DST vs EST (Going Backward)\n" << endl;

    {
        {
            DateTime    start (20060408);
            DateTime    test;
            int         i = 0;

            cout << "\tGoing from EST to DST\n" << endl;
            while (i++ <= 10)  {
                test = start;
                cout << test.string_format (DT_FORMAT::DT_TM2)
                     << " --- " << test.time () << endl;
                start.add_days (-1);
            }
        }

        {
            DateTime    start (20051105);
            DateTime    test;
            int         i = 0;

            cout << endl << endl;
            cout << "\tGoing from DST to EST\n" << endl;
            while (i++ <= 10)  {
                test = start;
                cout << test.string_format (DT_FORMAT::DT_TM2)
                     << " --- " << test.time () << endl;
                start.add_days (-1);
            }
        }

        {
            DateTime    start (20060408);

            cout << endl << endl;
            cout << "\tGoing from EST to DST in one shot\n" << endl;

            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
            start.add_days (-10);
            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
        }

        {
            DateTime    start (20051105);

            cout << endl << endl;
            cout << "\tGoing from DST to EST in one shot\n" << endl;

            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
            start.add_days (-10);
            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
        }

        {
            DateTime    start (20090309, 16, 30);

            cout << endl << endl;
            cout << "\tGoing from EST to DST in one shot (2)\n" << endl;

            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
            start.add_days (-20);
            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
        }

        {
            DateTime    start (20081103, 16, 30);

            cout << endl << endl;
            cout << "\tGoing from DST to EST in one shot (3)\n" << endl;

            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
            start.add_weekdays (-1);
            cout << start.string_format (DT_FORMAT::DT_TM2)
                 << " --- " << start.time () << endl;
        }
    }

    {
        cout << "\n----- Testing DateTime going over year boundary\n" << endl;

        {
            DateTime    test (20081225, 16, 30);
            int         i = 0;

            cout << endl << endl;
            cout << "\tGoing Forward\n" << endl;

            while (i++ <= 10)  {
                cout << test.string_format (DT_FORMAT::DT_TM2)
                     << " --- " << test.time () << endl;
                test.add_days (1);
            }
        }
    }

    {
        {
            DateTime    test (20080105, 16, 30);
            int         i = 0;

            cout << endl << endl;
            cout << "\tGoing Backward\n" << endl;

            while (i++ <= 10)  {
                cout << test.string_format (DT_FORMAT::DT_TM2)
                     << " --- " << test.time () << endl;
                test.add_days (-1);
            }
        }
    }

    {
        cout << "\n----- Testing DateTime's time zone changes\n" << endl;

        DateTime    local_now;
        DateTime    gmt_now (DT_TIME_ZONE::GMT);
        DateTime    b_aires_now (DT_TIME_ZONE::AM_BUENOS_AIRES);
        DateTime    tehran_now (DT_TIME_ZONE::AS_TEHRAN);
        DateTime    tokyo_now (DT_TIME_ZONE::AS_TOKYO);
        DateTime    sydney_now (DT_TIME_ZONE::AU_SYDNEY);
        DateTime    nz_now (DT_TIME_ZONE::NZ);
        DateTime    moscow_now (DT_TIME_ZONE::EU_MOSCOW);
        DateTime    shang_now (DT_TIME_ZONE::AS_SHANGHAI);
        DateTime    berlin_now (DT_TIME_ZONE::EU_BERLIN);
        DateTime    paris_now (DT_TIME_ZONE::EU_PARIS);
        DateTime    stock_now (DT_TIME_ZONE::EU_STOCKHOLM);
        DateTime    ny_now (DT_TIME_ZONE::AM_NEW_YORK);
        DateTime    la_now (DT_TIME_ZONE::AM_LOS_ANGELES);
        DateTime    local_now_2;

        cout << "Now Local:        " << local_now << endl;
        cout << "GMT Local:        " << gmt_now << endl;
        cout << "Now Buenos Aires: " << b_aires_now << endl;
        cout << "Now Tehran:       " << tehran_now << endl;
        cout << "Now Tokyo:        " << tokyo_now << endl;
        cout << "Now Sydeny:       " << sydney_now << endl;
        cout << "Now New Zealand:  " << nz_now << endl;
        cout << "Now Moscow:       " << moscow_now << endl;
        cout << "Now Shanghai:     " << shang_now << endl;
        cout << "Now Berlin:       " << berlin_now << endl;
        cout << "Now Paris:        " << paris_now << endl;
        cout << "Now Stockholm:    " << stock_now << endl;
        cout << "Now New York:     " << ny_now << endl;
        cout << "Now Los Amgeles:  " << la_now << endl;
        cout << "Now Local (2):    " << local_now_2 << endl;

        local_now.set_timezone (DT_TIME_ZONE::AU_SYDNEY);
        cout << "\nGoing from Local to Sydney: " << local_now << endl;

        DateTime    local (20091123, 9, 38, 43, 345);

        cout << "\nLocal Date/Time: " << local << endl;
        local.set_timezone (DT_TIME_ZONE::AU_SYDNEY);
        cout << "\nLocal changed to Sydney: " << local << endl;
    }

    {
        // Testing DateTime's const char * constructor

         const DateTime dt1 ("20100207 12:31");

         if (dt1.string_format (DT_FORMAT::DT_TM2) !=
                 "02/07/2010 12:31:00.000")  {
             std::cout << "ERROR: "
                       << dt1.string_format (DT_FORMAT::DT_TM2) << " != "
                       << "02/07/2010 12:31:00.000" << std::endl;
             return (EXIT_FAILURE);
         }

         const DateTime dt2 ("02/08/2010 12:31:56", DT_DATE_STYLE::AME_STYLE);

         if (dt2.string_format (DT_FORMAT::DT_TM2) !=
                 "02/08/2010 12:31:56.000")  {
             std::cout << "ERROR: "
                       << dt2.string_format (DT_FORMAT::DT_TM2) << " != "
                       << "02/08/2010 12:31:56.000" << std::endl;
             return (EXIT_FAILURE);
         }

         const DateTime dt3 ("2010/02/09 12:31:56", DT_DATE_STYLE::EUR_STYLE);

         if (dt3.string_format (DT_FORMAT::DT_TM2) !=
                 "02/09/2010 12:31:56.000")  {
             std::cout << "ERROR: "
                       << dt3.string_format (DT_FORMAT::DT_TM2) << " != "
                       << "02/09/2010 12:31:56.000" << std::endl;
             return (EXIT_FAILURE);
         }

         const DateTime dt4 ("  2010/02/10 12:31:56", DT_DATE_STYLE::EUR_STYLE);

         if (dt4.string_format (DT_FORMAT::DT_TM2) !=
                 "02/10/2010 12:31:56.000")  {
             std::cout << "ERROR: "
                       << dt4.string_format (DT_FORMAT::DT_TM2) << " != "
                       << "02/10/2010 12:31:56.000" << std::endl;
             return (EXIT_FAILURE);
         }

         const DateTime dt5 ("    02/11/2010 12:31:56",
                             DT_DATE_STYLE::AME_STYLE);

         if (dt5.string_format (DT_FORMAT::DT_TM2) !=
                 "02/11/2010 12:31:56.000")  {
             std::cout << "ERROR: "
                       << dt5.string_format (DT_FORMAT::DT_TM2) << " != "
                       << "02/11/2010 12:31:56.000" << std::endl;
             return (EXIT_FAILURE);
         }

         const DateTime dt6 (20190110, 13, 56, 23, 123456987);

         if (dt6.string_format (DT_FORMAT::DT_PRECISE) !=
                 "1547146583.123456987")  {
             std::cout << "ERROR: "
                       << dt6.string_format (DT_FORMAT::DT_PRECISE) << " != "
                       << "1547146583.123456987" << std::endl;
             // return (EXIT_FAILURE);
         }
    }

    {
        // Testing DateTime's add_months()

        DateTime    now (20190530, 11, 15, 5, 123456789);

        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");

        now.add_months (1);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "06/30/2019 11:15:05.123");

        now.add_months (-1);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");

        now.add_months (10);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "03/30/2020 11:15:05.123");

        now.add_months (-10);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");

        now.add_months (9);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/29/2020 11:15:05.123");
    }

    {
        // Testing DateTime's add_years()

        DateTime    now (20160229, 11, 15, 5, 123456789);

        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/29/2016 11:15:05.123");

        now.add_years (1);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/28/2017 11:15:05.123");

        now.add_years (-1);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/28/2016 11:15:05.123");

        now.add_years (5);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/28/2021 11:15:05.123");

        now.add_years (-5);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/28/2016 11:15:05.123");

        now.add_years (9);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "02/28/2025 11:15:05.123");
    }

    {
        // Testing DateTime's long_time()

        const DateTime  dt1 (20190522, 11, 15, 5, 123456789,
                             DT_TIME_ZONE::AM_NEW_YORK);

        assert(dt1.long_time() == 1558538105123456789);

        const DateTime  dt2 (20190522, 11, 15, 5, 5,
                             DT_TIME_ZONE::AM_NEW_YORK);

        assert(dt2.long_time() == 1558538105000000005);

        const DateTime  dt3 (20190522, 11, 15, 0, 0,
                             DT_TIME_ZONE::AM_NEW_YORK);

        assert(dt3.long_time() == 1558538100000000000);
        assert(dt3.time() == 1558538100);
    }

    {
        // Testing DateTime's add_nanoseconds()

        DateTime    now (20190530, 11, 15, 5, 123000000,
                         DT_TIME_ZONE::AM_NEW_YORK);

        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");

        now.add_nanoseconds (1000000000);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:06.123");
        assert(now.long_time() == 1559229306123000000);
        now.add_nanoseconds (-1000000000);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");
        assert(now.long_time() == 1559229305123000000);
        now.add_nanoseconds (1000010000);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:06.123");
        assert(now.long_time() == 1559229306123010000);
        now.add_nanoseconds (-1000010000);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");
        assert(now.long_time() == 1559229305123000000);

        now.add_nanoseconds (9999);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");
        assert(now.long_time() == 1559229305123009999);
        now.add_nanoseconds (-9999);
        assert(now.string_format (DT_FORMAT::DT_TM2) ==
                   "05/30/2019 11:15:05.123");
        assert(now.long_time() == 1559229305123000000);

        now.add_nanoseconds (-123000000);
        assert(now.long_time() == 1559229305000000000);
        now.add_nanoseconds (500000000);
        assert(now.long_time() == 1559229305500000000);
        now.add_nanoseconds (500000000);
        assert(now.long_time() == 1559229306000000000);
        now.add_nanoseconds (500000000);
        assert(now.long_time() == 1559229306500000000);
        now.add_nanoseconds (500000000);
        assert(now.long_time() == 1559229307000000000);

        now.add_nanoseconds (-500000000);
        assert(now.long_time() == 1559229306500000000);
        now.add_nanoseconds (-500000000);
        assert(now.long_time() == 1559229306000000000);
        now.add_nanoseconds (-500000000);
        assert(now.long_time() == 1559229305500000000);
    }

    return (EXIT_SUCCESS);
}

// ----------------------------------------------------------------------------

// Local Variables:
// mode:C++
// tab-width:4
// c-basic-offset:4
// End: