app/views/shared/meter_attributes/_time_of_year.html.erb
<div class="row">
<div class="col-12">
<%= form.label label.try(:to_s).try(:humanize), required: field.required? %>
<%= form.hint field.hint %>
</div>
<div class="col-6">
<%= form.input field_name + '[month]', as: :integer, input_html: {value: value ? value['month'] : ''}, required: field.required?, min: 1, max: 12, label: 'month'%>
</div>
<div class="col-6">
<%= form.input field_name + '[day_of_month]', as: :integer, input_html: {value: value ? value['day_of_month'] : ''}, required: field.required?, min: 1, max: 31, label: 'day of month' %>
</div>
</div>