fields_for with accepts_nested_attributes: how to pass a value to a label

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I can't figure out how to pass a value from the following object build in the controller:

class TimesheetsController < AC
...
  def new
    @timesheet = current_user.timesheets.new
    now = Date.today
    #generating 7 time entries: monday through sunday
    (now.beginning_of_week..now.end_of_week).step { |date| @timesheet.time_entries.build(:workdate; date)
  end
end
...

In the Timesheet model I defined accepts_nested_attributes for time_entries association:

class Timesheet < AR
  has_many :time_entries, :dependent: :destroy
  accepts_nested_attributes_for :time_entries, reject_if: proc { |attr| attr['worktime].blank? }
end

in the Timesheet 'new' page:

<%= form_for @timesheet do |f|%>
  <%= f.label :status%>
  <%= f.text_field :status %>
  <%= fields_for :time_entries do | entry_form| %>
# how to display at this place the needed workdate for every time entry ?
    <%= entry_form.label, value: ???? %>
    <%= entry_form.text_field :worktime%> #worked time to be entered here as 0.5 or 1 day
  <% end%>
<% end %

Thanks and regards