What is FirstJoin?
You can check the first time that you joined the server. This plugin is extremely lightweight and stores player data via UUID.

Commands:
/firstjoin - Check the first time you joined.
/firstjoin reload - Reload the configuration.

Permission:
firstjoin.admin - Allows you to execute all the commands.

Placeholders:
%firstjoin_date% - Displays the first time you joined.

Images:

Spoiler: config.yml

Code (Text):

settings:
  date-format: "MM/dd/yyyy"

messages:
  first-join: "&eYou first joined the server &a{0}&e."
  reloaded: "&aYou have successfully reloaded in &f{0} &ams."
  no-permission: "&cYou don't have permission to &d{0}&c."