languagefile.yml

# Search strftime on google to find time formats and default day month etc annotation
en:
# (or sv: whatever)
  time:
    formats:
      short: "%A %e %B"
      time: "%H:%M"
      default: "%d/%m/%Y %H:%M"
      small: '%a %d %B'
  date:
    day_names: [Zondag, Maandag, Dinsdag, Woensdag, Donderdag, Vrijdag, Zaterdag]
    month_names: [~, januari, februari, maart, april, mei, juni, juli, augustus, september, oktober, november, december]
    defaullt: "%d/%m/%Y %H:%M"
    abbr_day_names: [Zo, Ma, Di, Wo, Do, Vr, Za]


Then in your views do:
<%=  = l @article.date, format: :short # Where :short matches the time format you want