What's the best way to save these articles that would make them easy to post in chronological order?

IMO, there are a few main options.

• You can store them in an RDBMS, with a date field.
• You could also keep a directory structure that reflects the dates (articles/2001/12/11.1.html, 11.2.html, etc - or whatever best suits you).
• You could even keep a header in each article, in a predetermined format, that contains the date.
• An XML DTD could be drawn up to contain the information for each article (including specifically the date).

These are just a few examples of ways to handle it... all of which are very well suited to be done in Perl. =)