Here you see the information displayed concerning where in a month a date of birth is located. A “Warning” is displayed when applying a person whenever the time of birth comes near to a Change of Chi.
So if you want to examine the effect of that, or if the minute is very close to the change of the hour, you may choose to tentatively set “Move the hour of birth” to an hour or a day for example - and examine the results on Four Pillars with Combinations as well as on Mansions and fates.