17.2.3.1 Day of the Week and Week Counter

The Calendar counter also keeps track of the days within the weeks, and the weeks in a year. These needs are to be set correctly before starting the RTC to match the day of the week and week for the current date and time. The day of the week counter increments from 1 to 7 and the week counter is incremented as the day of week goes from 7 to 1.