bool HDate::is_leap_year(int year){
int length_of_year;
int days_from_3744;
days_from_3744 = hdate_days_from_3744 (year);
length_of_year = hdate_days_from_3744 (year + 1) - days_from_3744;
if (length_of_year>365){
return true;
}
return false;
}
/**
@brief Converting from the Julian day to the Hebrew day
@author Amos Shapir 1984 (rev. 1985, 1992) Yaacov Zamir 2003-2008
@param jd Julian day
@param day Return Day of month 1..31
@param month Return Month 1..14 (13 - Adar 1, 14 - Adar 2)
@param year Return Year in 4 digits e.g. 2001
*/
void
hdate_jd_to_hdate (int jd, int *day, int *month, int *year, int *jd_tishrey1, int *jd_tishrey1_next_year)
{
int days;
int size_of_year;
int internal_jd_tishrey1, internal_jd_tishrey1_next_year;
/* calculate Gregorian date */
hdate_jd_to_gdate (jd, day, month, year);
/* Guess Hebrew year is Gregorian year + 3760 */
*year = *year + 3760;
internal_jd_tishrey1 = hdate_days_from_3744 (*year) + 1715119;
internal_jd_tishrey1_next_year = hdate_days_from_3744 (*year + 1) + 1715119;
/* Check if computed year was underestimated */
if (internal_jd_tishrey1_next_year <= jd)
{
*year = *year + 1;
internal_jd_tishrey1 = internal_jd_tishrey1_next_year;
internal_jd_tishrey1_next_year = hdate_days_from_3744 (*year + 1) + 1715119;
}
size_of_year = internal_jd_tishrey1_next_year - internal_jd_tishrey1;
/* days into this year, first month 0..29 */
days = jd - internal_jd_tishrey1;
/* last 8 months allways have 236 days */
if (days >= (size_of_year - 236)) /* in last 8 months */
{
days = days - (size_of_year - 236);
*month = days * 2 / 59;
*day = days - (*month * 59 + 1) / 2 + 1;
*month = *month + 4 + 1;
/* if leap */
if (size_of_year > 355 && *month <=6)
*month = *month + 8;
}
else /* in 4-5 first months */
{
/* Special cases for this year */
if (size_of_year % 10 > 4 && days == 59) /* long Heshvan (day 30 of Heshvan) */
{
*month = 1;
*day = 30;
}
else if (size_of_year % 10 > 4 && days > 59) /* long Heshvan */
{
*month = (days - 1) * 2 / 59;
*day = days - (*month * 59 + 1) / 2;
}
else if (size_of_year % 10 < 4 && days > 87) /* short kislev */
{
*month = (days + 1) * 2 / 59;
*day = days - (*month * 59 + 1) / 2 + 2;
}
else /* regular months */
{
*month = days * 2 / 59;
*day = days - (*month * 59 + 1) / 2 + 1;
}
*month = *month + 1;
}
/* return the 1 of tishrey julians */
if (jd_tishrey1 && jd_tishrey1_next_year)
{
*jd_tishrey1 = internal_jd_tishrey1;
*jd_tishrey1_next_year = internal_jd_tishrey1_next_year;
}
return;
}