What does "calendar anomalies" mean

Question

 From calendar anomalies to “law on the market,” we have now found our focus within our quest for behavioral departures from strict rationality in the evaluation of financial risk.

Answer 1

بی قاعدگی های تقویمی

A calendar effect is any market anomaly or economic effect which appears to be related to the calendar. Such effects include the apparently different behavior of stock markets on different days of the week, different times of the month, and different times of year (seasonal tendencies).