Adaは違う！＞＜　Adaはちゃんと型を使う！＞＜　さすがAda！！！＞＜ Adaしか勝たん！＞＜

Standard library: Dates & Times — learn. adacore. com - https://learn.adacore.com/courses/intro-to-ada/chapters/standard_library_dates_times.html

ada.calendar - https://www2.seas.gwu.edu/~adagroup/adalib_html/ada-html/a-calend.html