I have been looking at a few things about Bazi and Ze Ri, trying to see what influence the date has on the people around me (especially negative influences). It is said that a key factor is the personal breaker day, which is the day whose earthly branch clashes with the birth year pillar (your Chinese zodiac sign).
I wonder...could there also be negative effects if a day clashes with a person's birth pillar of the Day (Master Day) or birth Pillar of the Month?