Rails 3 – time_ago_in_words says “ABOUT 2 hours ago”

You can change this via your I18n locale file. In config/locales/en.yml…

"en":
  datetime:
    distance_in_words:
      about_x_hours:
        # The defaults are "about 1 hour" and "about %{count} hours"
        one: "1 hour"
        other: "%{count} hours"

See the default locale file in actionpack for a complete reference.