The moderator has deleted your other two posts in regards to this question.
If you post in the wrong forum, the moderator will usually move the thread to the appropriate forum, you do not have to post the same question twice.
My comment was to remind you to post in the proper forum, and to alert the moderator that the thread should be moved.
If you have any further questions, please REPLY to the post, do not create another one.
As to your concerns about the formula displaying the First Day as number 1,
this was discussed in the referenced thread, beginning at response # 7.
Does the suggested modified formula not work for you?