Edit my ebook (very simple)

This project is very simple. I have an ebook split into 52 parts here: [login to view URL] I mistakenly used calendar days in each of these sections and need someone to quickly change them to generic "relative days" For example if the first listed day in a section is July 5, you would change it to "Day 1" July 6 would be changed to "Day 2" July 7 would be changed to "Day 3" And so forth until all 7 days in that section are changed. Repeat this for all sections, ALWAYS starting with Day 1 and ending with Day 7. There are always 7 days an a section. You will NEVER write a Day 8 or higher. There is only one change for each Day 1, Day 2, Day 3 per section. So with 52 sections total, that means there are roughly 364 simple changes to make. (perhaps plus or minus 1 or 2) This should be a quick project for you to complete