Time.zone.parse(_, options) => Time.zone.strptime(_, options)

app/decorators/champ_decorator.rb

@@ -24,7 +24,7 @@ class ChampDecorator < Draper::Decorator
       if type_champ == TypeDeChamp.type_champs.fetch(:date)
         object.value
       elsif type_champ == TypeDeChamp.type_champs.fetch(:datetime) && object.value != ' 00:00'
-        Time.zone.parse(object.value, "%Y-%m-%d %H:%M").strftime("%Y-%m-%d")
+        Time.zone.strptime(object.value, "%Y-%m-%d %H:%M").strftime("%Y-%m-%d")
       end
     end
   end

app/models/champs/datetime_champ.rb

@@ -30,7 +30,7 @@ class Champs::DatetimeChamp < Champ
           nil
         end
     elsif /^\d{2}\/\d{2}\/\d{4}\s\d{2}:\d{2}$/.match?(value) # old browsers can send with dd/mm/yyyy hh:mm format
-      self.value = Time.zone.parse(value, "%d/%m/%Y %H:%M").strftime("%Y-%m-%d %H:%M")
+      self.value = Time.zone.strptime(value, "%d/%m/%Y %H:%M").strftime("%Y-%m-%d %H:%M")
     elsif !(/^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}$/.match?(value)) # a datetime not correctly formatted should not be stored
       self.value = nil
     end

lib/tasks/2018_01_18_clean_datetime_in_champs.rake

@@ -12,7 +12,7 @@ namespace :'2018_01_18_clean_datetime_in_champs' do
 
     # Match "dd/mm/YYYY HH:MM" => "YYYY-mm-dd HH:MM"
     datetime_champs.select { |c| /^\d{2}\/\d{2}\/\d{4}\s\d{2}:\d{2}$/ =~ c.value }.each do |c|
-      formated_date = Time.zone.parse(c.value, "%d/%m/%Y %H:%M").strftime("%Y-%m-%d %H:%M")
+      formated_date = Time.zone.strptime(c.value, "%d/%m/%Y %H:%M").strftime("%Y-%m-%d %H:%M")
       rake_puts "cleaning #{c.value} => #{formated_date}"
       c.update_columns(value: formated_date)
     end