ruby on rails - Bootstrap datepicker default value simple_form_for -

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i using bootstrap date picker enable selection of dates in form using simple_form_for. example

  <%= f.input :payment_date, as: :string, input_html: { class: "datepicker" } %>

my date picker uses format of dd-mm-yyyy

i set today's date default value in form using simple_form_for, ideas on how can that?

<%= f.input :payment_date, as: :string, input_html: { class: "datepicker", value: time.now.strftime('%d-%m-%y') } %>

another format is: (working active admin gem)

f.input :date, as: :date_picker, :input_html => { :value => date.today}

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