When is Haizi Geng Xin?

Haizi is the earthly branch, and Geng Xin is the heavenly stem. If the earthly calendar takes twelve days as a cycle, each cycle has a "Hai" day and a "Zi" day; If the calendar day takes ten days as a cycle, each cycle has a "Geng Day" and a "Xin Day". But generally speaking, the heavenly stems are matched with earthly branches to mark dates, such as "Gengzi" Day and "Xinhai" Day. Because there are ten days and twelve earthly branches, it is a cycle of sixty days, which is called "Sixty Flowers", so every "Sixty Flowers" cycle has a "Gengzi" day and a "Xinhai" day. So please think about it, it's hard to accurately answer "Haizi Geng Xin refers to that day"!