ARISTEAN CALENDAR DETERMINATION OF THE DAY OF THE WEEK

 Month number in the quarter 1 2 3 Maximum number of days in month* 31 30 30 First Quarter Jan Feb Mar Second Quarter Apr May Jun Third Quarter Jul Aug Sep Fourth Quarter Oct Nov Dec Constant to be added to date 0 3 5

*Exceptions are December 31 which is World Peace Day or Grand Sabbath and June 31 which is Leap Year Day or Glorious Sabbath. Both these dates do not have the regular name day of the week.

 1 Determine which month of the quarter the date belongs to. Example: August is the second month of the quarter. 2 Add the constant to the date to get the sum. Note that the constant to be added is the number of blank spaces before the first day of the month in question in the calendar. Example: August 22. Constant for August is 3 since it is the second month of the quarter. Hence, add 3 to 22. Sum is 25. 3 Divide the sum by 7 and find the remainder. The remainder determines the day of the week.
 If remainder is 1 2 3 4 5 6 0 The day is Mon Tue Wed Thu Fri Sat Sun

Sample illustrations:

 1 April 15 April is the first month of the quarter, hence, 0 is added to 15 to give a total of 15. 15 is divided by 7 gives 2 remainder 1. Hence, April 15 is Monday. 2 August 22 August is the second month of the quarter, so 3 has to be added to the date giving a total of 25. Divide 25 by 7. The answer is 3, remainder 4. Hence, August 22 is Thursday. 3 June 9 June is the third month of the quarter. Therefore, add 5 to 9 giving 14. Divide 14 by 7 gives 2 with 0 remainder. Hence, June 9 is Sunday. 