wxString pgsDateTimeGen::random()
{
// Get a random number representing seconds
MAPM result = pgsMapm::pgs_str_mapm(m_randomizer->random()), quot, rem;
// Use hours and seconds for avoiding overflows of seconds
result.integer_div_rem(3600, quot, rem);
long hours, seconds;
pgsMapm::pgs_mapm_str(quot, true).ToLong(&hours);
pgsMapm::pgs_mapm_str(rem, true).ToLong(&seconds);
wxTimeSpan time_span(hours, 0, seconds, 0);
// Add the TimeSpan to the MinDate
wxDateTime aux_min(m_min);
aux_min.Add(time_span);
// Post conditions
wxASSERT(aux_min.IsLaterThan(m_min) || aux_min.IsEqualTo(m_min));
wxASSERT(aux_min.IsEarlierThan(m_max) || aux_min.IsEqualTo(m_max));
return aux_min.Format(wxT("%Y-%m-%d %H:%M:%S"));
}
void DateUtils::convertAbsolute2DMY(MAPM absolute, MAPM& day, MAPM& month, MAPM& year)
{
absolute += 1;
bool bc = absolute.sign() <= 0;
bool fix = false;
MAPM div, rem;
absolute.integer_div_rem(days_in_400_years, div, rem);
year = div * 400;
absolute = rem;
absolute.integer_div_rem(days_in_100_years, div, rem);
if(div <= -4) fix = true;
if(div >= 4) {
div -= 1;
rem += days_in_100_years;
}
year += div * 100;
absolute = rem;
absolute.integer_div_rem(days_in_4_years, div, rem);
year += div * 4;
absolute = rem;
absolute.integer_div_rem(days_in_1_years, div, rem);
if(div <= -4) fix = true;
if(div >= 4) {
div -= 1;
rem += days_in_1_years;
}
year += div;
absolute = rem;
if(bc) {
if(fix && absolute.sign() == 0) {
// Correct off by one error in year calculations
// due to negative leap years
absolute += 1;
}
else {
--year;
absolute += daysInYear(year);
}
}
else {
if(absolute.sign() != 0) {
++year;
}
}
month = 12;
day = 31;
int *days = isLeapYear(year) ? days_before_month_leap : days_before_month;
for(int i = 11; i >= 0; --i) {
if(absolute > days[i]) {
month = i + 1;
day = absolute - days[i];
break;
}
}
}
