constellationByNSDate the hard way

constellationByNSDate.c

char *constellationByNSDate(NSDate *date) {
    static char *constellations[13] = {"Capricorn","Aquarius","Pisces","Aries","Taurus","Gemini","Cancer","Leo","Virgo","Libra","Scorpio","Sagittarius","Capricorn"};
    static unsigned short constellationSeperates[12] = {20,19,21,21,21,22,23,23,23,24,22,22};
    unsigned short dateStr[5];
    NSLocale *CNLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_Hans_CN"];
    [[date descriptionWithLocale:CNLocale] getCharacters:(unichar*)dateStr range:(NSRange){5, 5}];
    unsigned short month = (dateStr[0] - '0') * 10 + (dateStr[1] - '0') - 1;
    unsigned short day = (dateStr[3] - '0') * 10 + (dateStr[4] - '0');
    return constellations[month + (day < constellationSeperates[month] ? 0 : 1)];
}