What is Jianchu Twelve Day Officers?

A system of twelve recurring day types that cycle through the lunar months: Establish (建), Remove (除), Full (滿), Balance (平), Set (定), Hold (執), Break (破), Critical (危), Accomplish (成), Receive (收), Open (開), Close (閉). Each carries a base quality rating from the Xieji Bianfang Shu and governs which activities are favorable or restricted on that day.

Source: Xieji Bianfang Shu (協紀辨方書), Vol. 9