Validate the date format

config/initializers/validates_timeliness.rb

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+ValidatesTimeliness.setup do |config|
+  # Extend ORM/ODMs for full support (:active_record, :mongoid).
+  # config.extend_orms = [ :active_record ]
+  #
+  # Default timezone
+  # config.default_timezone = :utc
+  #
+  # Set the dummy date part for a time type values.
+  # config.dummy_date_for_time_type = [ 2000, 1, 1 ]
+  #
+  # Ignore errors when restriction options are evaluated
+  # config.ignore_restriction_errors = false
+  #
+  # Re-display invalid values in date/time selects
+  # config.enable_date_time_select_extension!
+  #
+  # Handle multiparameter date/time values strictly
+  # config.enable_multiparameter_extension!
+  #
+  # Shorthand date and time symbols for restrictions
+  # config.restriction_shorthand_symbols.update(
+  #   :now   => lambda { Time.current },
+  #   :today => lambda { Date.current }
+  # )
+  #
+  # Use the plugin date/time parser which is stricter and extendable
+  # config.use_plugin_parser = false
+  #
+  # Add one or more formats making them valid. e.g. add_formats(:date, 'd(st|rd|th) of mmm, yyyy')
+  # config.parser.add_formats()
+  #
+  # Remove one or more formats making them invalid. e.g. remove_formats(:date, 'dd/mm/yyy')
+  # config.parser.remove_formats()
+  #
+  # Change the amiguous year threshold when parsing a 2 digit year
+  # config.parser.ambiguous_year_threshold =  30
+  #
+  # Treat ambiguous dates, such as 01/02/1950, as a Non-US date.
+  # config.parser.remove_us_formats
+end

config/locales/validates_timeliness.en.yml

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+en:
+  errors:
+    messages:
+      invalid_date: "is not a valid date"
+      invalid_time: "is not a valid time"
+      invalid_datetime: "is not a valid datetime"
+      is_at: "must be at %{restriction}"
+      before: "must be before %{restriction}"
+      on_or_before: "must be on or before %{restriction}"
+      after: "must be after %{restriction}"
+      on_or_after: "must be on or after %{restriction}"
+  validates_timeliness:
+    error_value_formats:
+      date: '%Y-%m-%d'
+      time: '%H:%M:%S'
+      datetime: '%Y-%m-%d %H:%M:%S'