void Solar2Lunar(struct LibLunarContext *ctx,
SSLunarSimpleDate *solar)
{
long offset;
if (ctx == NULL) {
fprintf(stderr, "Soloar2Lunar: ctx pointer cannot be NULL");
return;
}
if (!libLunarCheckYearRange(solar->year)) {
fprintf(stderr, "Solar2Lunar: the year provide exceeds lib's ablility.");
return;
}
offset = Solar2Day(solar);
solar->weekday = (offset + SolarFirstDate.weekday) % 7;
/* A lunar day begins at 11 p.m. */
if (solar->hour == 23)
offset++;
Day2Lunar(ctx, offset);
ctx->_lunar.hour = solar->hour;
CalGZ(offset, &ctx->_lunar, &ctx->_gan, &ctx->_zhi);
jieAlert = JieDate(solar, &ctx->_lunar2);
ctx->_lunar2.day = ctx->_lunar.day;
ctx->_lunar2.hour = ctx->_lunar.hour;
CalGZ(offset, &ctx->_lunar2, &ctx->_gan2, &ctx->_zhi2);
}
void Solar2Lunar()
{
long offset;
Date *d;
offset = Solar2Day(&solar);
solar.weekday = (offset + SolarFirstDate.weekday) % 7;
/* A lunar day begins at 11 p.m. */
if (solar.hour == 23)
offset++;
Day2Lunar(offset, &lunar);
lunar.hour = solar.hour;
CalGZ(offset, &lunar, &gan, &zhi);
jieAlert = JieDate(&solar, &lunar2);
lunar2.day = lunar.day;
lunar2.hour = lunar.hour;
CalGZ(offset, &lunar2, &gan2, &zhi2);
}
void Day2Solar(LibLunarContext *ctx,
long offset)
{
int i, m, days;
SSLunarSimpleDate *d = &ctx->_solar;
/* offset is the number of days from SolarFirstDate */
offset -= Solar2Day(&LunarFirstDate); /* the argument is negative */
/* offset is now the number of days from SolarFirstDate.year.1.1 */
for (i=SolarFirstDate.year;
(i<SolarFirstDate.year+Nyear) && (offset > 0); i++)
offset -= 365 + LeapYear(i);
if (offset<0)
{
--i; /* LeapYear is a macro */
offset += 365 + LeapYear(i);
}
if (i==(SolarFirstDate.year + Nyear)) Error("Year out of range.");
d->year = i;
/* assert(offset<(365+LeapYear(i))); */
for (m=1; m<=12; m++)
{
days = daysInSolarMonth[m];
if ((m==2) && LeapYear(i)) /* leap February */
days++;
if (offset<days)
{
d->month = m;
d->day = offset + 1;
return;
}
offset -= days;
}
}