<div class="form-group">
  {{>"systems/foundryvtt-reve-de-dragon/templates/common/timestamp.hbs" 
    (timestamp-extract system.temporel.debut)
      path='system.temporel.debut'
      label=(either labeldebut 'Date début')
      disabled=''
  }}
  
</div>
<div class="form-group">
  {{>"systems/foundryvtt-reve-de-dragon/templates/common/timestamp.hbs" 
    (timestamp-extract system.temporel.fin)
      path='system.temporel.fin'
      label=(either labelfin 'Date fin')
      disabled=''
  }}
</div>