public static double datetimedateToDayNumber(datetimeDate date, datetimeSuccess success)
{
double days;
success.success = true;
days = -79623d;
/* Day 1752-01-01*/
days = days + datetimedaysInYears(date.year);
days = days + datetimedaysInMonths(date.month, date.year);
days = days + date.day - 1d;
return(days);
}
public static datetimeDate datetimedayToDate(double dayNr, datetimeSuccess success)
{
datetimeDate date;
DoubleReference remainder;
date = new datetimeDate();
success.success = true;
remainder = new DoubleReference();
remainder.doubleValue = dayNr + 79623d;
/* Days since 1752-01-01. Day 0: Thursday, 1970-01-01*/
/* Find year.*/
date.year = datetimegetYearFromDayNr(remainder.doubleValue, remainder);
/* Find month.*/
date.month = datetimegetMonthFromDayNr(remainder.doubleValue, date.year, remainder);
/* Find day.*/
date.day = 1d + remainder.doubleValue;
return(date);
}
public static bool datetimeisLeapYear(double year, datetimeSuccess success)
{
bool itIsLeapYear;
if (year >= 1752d)
{
success.success = true;
if (divisibleBy(year, 4d))
{
if (divisibleBy(year, 100d))
{
if (divisibleBy(year, 400d))
{
itIsLeapYear = true;
}
else
{
itIsLeapYear = false;
}
}
else
{
itIsLeapYear = true;
}
}
else
{
itIsLeapYear = false;
}
}
else
{
success.success = false;
itIsLeapYear = false;
success.errorMessage = "Gregorian calendar was not in general use.".ToCharArray();
}
return(itIsLeapYear);
}
