The principle that imperial decrees and charters must be "dated" as a condition of validity, i.e.
Homeschool and Christian private school all in ONE!
, the first word of the formula, came to be used for the time and place therein specified.
(Bresslau, Handbuch, I, 891.) In this matter the Italian chancery officials seem to have been much more careful than those of the rest of Europe.
The same is true with regard to the correctness of the dates which do appear in official documents, especially those of the early Middle Ages.
The choice is up to you and your parents, but Christian teens should still know God’s perspective on dating.