app/views/reservations/_datepicker_javascript_options.html.haml
:javascript
var datepicker_options = {
autoclose: true,
minuteStep: 1,
startView: 1,
todayHighlight: true,
startDate: "#{I18n.l(Time.current, :format => :datepicker)}}",
showMeridian: #{I18n.t(:show_meridian, :scope => :time)},
format: '#{I18n.t('time.formats.javascript_datepicker')}'
};
$('#reservation_starts_at').datetimepicker(datepicker_options);
$('#reservation_ends_at').datetimepicker(datepicker_options)