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Q1 = January to March
Q2 = April to June
Q3 = July to September
Q4 = October to December
Q. How do you calculate months?
A. We also use the ISO standard to determine what weeks get included in a month timeframe:
- A week is included in a month if it has four or more days in that month.
- It is possible for a month to have more than four weeks, e.g., April 2015 has five weeks.
- A week can only be assigned to a single month.
So, for example, if you're searching for months as a timeframe in a Market Share or Multi-ISBN report and you choose May as a year-over-year comparison month, each May will have a different number of weeks; May 2018 will have five weeks and May 2017 will have four weeks.
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