For this, you will need to consult the book Pay Attention to Daniel’s Prophecy! (Unfortunately, I don’t think it can be found on JW.Org)
In the first exercise, review pages 141 to 143, and page 301.
(1) Open Excel
(2) In A1 enter: 6/21/1918
(3) In A2 enter the formula: =A1-1260
In the second exercise, review pages 300 and 301.
(1) In A1 enter: 1/18/1919
(2) In A2 enter the formula: =A1+1290
In the third exercise, review pages 303-305, and page 301. (From what I can tell the book Deliverance was released during the convention that started on May 25, 1926—correct me if I’m wrong).
(1) In A1 enter: 9/4/1922
(2) In A2 enter: 5/25/1926
(3) In A3 enter the formula: =A2-A1
(4) Format A3 to Number
In the fourth exercise, review pages 177-179, and page 301.
(1) In A1 enter: 6/1/1938
(2) In A2 enter the formula: =A1+2300
Take 2 (since there are two begin dates are given)
(1) In A1 enter: 6/15/1938
(2) In A2 enter the formula: =A1+2300
WHY IT MATTERS
Page 304, paragraph 28: With all these prophetic marks to identify “the holy ones of the Supreme One”, what excuse can there be for failure to recognize them and associate with them!
Here is a question for JWs: What if these "prophetic marks" don't add up?