The Consecration to St. Joseph can be done at any time. Special dates are listed in the book. Below is a video by the author of the book, Father Don Calloway.
The Catholify app is available in the Apple Store and Google Play and contains the same Consecration to St. Joseph.
The Church is granting special indulgences during the Year of St. Joseph. During this period, the faithful will have the opportunity to commit themselves “with prayer and good works, to obtain, with the help of St. Joseph, head of the heavenly Family of Nazareth, comfort and relief from the serious human and social tribulations that besiege the contemporary world today.” (source: Vatican News) A full explanation of the the indulgences granted for this year, and of indulgences in general, will help everyone understand how to gain them and what a beauty this gift is to us and to the faithfully departed.
FORMED.org has many videos, studies, audio books about St. Joseph.