PMHUB-G which one is correct? 2 method of calculating ES and LS

 The question is regarding the method to be adhered to calculate Early Start(ES) and Late Start(LS).

  a) In some books(Rita Mulcay) the ES of
the first activity is taken as 0(zero) and early finish is
calculated as ES + duration = Early Finish

  b) In some books(Head First) the ES of
the first activity is taken as 1(one) and the early finish
is calculated as ES + duration - 1 = Early Finish.


When the question is regarding "What is the ES of an
activity". Both the books give different answers.....

http://pmhub.net/pmdigest/component/content/article/1-articles/115-critical-path

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