In technical and common parlance, the phrase "chronological order" indicates that the items are in order of occurrence or creation, oldest first (being the first in the chronology). So it's [ 1997, 1998, 1999 ] and not [ 1999, 1998, 1997 ]. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.