A calendar year corporation properly files a Subchapter S election on January 10, 2015. On what date

Question:

A calendar year properly files a Subchapter S election on January 10, 2015. On what date is the election effective? What if the election were filed on June 1, 2015?
Corporation
A Corporation is a legal form of business that is separate from its owner. In other words, a corporation is a business or organization formed by a group of people, and its right and liabilities separate from those of the individuals involved. It may...