MONGOID-5324 Remove deprecated EPOCH constant from Date and Time (#5239)

* Remove EPOCH constant from Date and Time. It is not used anywhere.

* add release note

Co-authored-by: shields <[email protected]>
Co-authored-by: Oleg Pudeyev <[email protected]>

Author: johnnyshields

docs/release-notes/mongoid-8.0.txt

@@ -324,4 +324,6 @@ Removed Deprecated Constants
 Mongoid 8 removes the following deprecated constants that are not expected
 to have been used outside of Mongoid:
 
+- ``Mongoid::Extensions::Date::EPOCH``
+- ``Mongoid::Extensions::Time::EPOCH``
 - ``Mongoid::Factory::TYPE``

lib/mongoid/extensions/date.rb

@@ -4,12 +4,6 @@ module Mongoid
   module Extensions
     module Date
 
-      # Constant for epoch - used when passing invalid times.
-      #
-      # @deprecated No longer used as a return value from #mongoize passed
-      #   an invalid date string.
-      EPOCH = ::Date.new(1970, 1, 1)
-
       # Convert the date into a time.
       #
       # @example Convert the date to a time.

lib/mongoid/extensions/time.rb

@@ -14,12 +14,6 @@ def __mongoize_time__
         self
       end
 
-      # Constant for epoch - used when passing invalid times.
-      #
-      # @deprecated No longer used as a return value from #mongoize passed
-      #   an invalid time string.
-      EPOCH = ::Time.utc(1970, 1, 1, 0, 0, 0)
-
       # Turn the object from the ruby type we deal with to a Mongo friendly
       # type.
       #