Determination of Date Given the Day and Month

ARISTEAN
CALENDAR

DETERMINATION OF THE DATE GIVEN THE DAY

The following are the steps in determining the date given the day of the week and month in the Aristean Calendar.

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 day number	7	4	2

* 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.	With the given month, determine the constant to be used in step 2. The constants for the months as shown in the above table are: 7 - for the first months of the quarter, i.e. Jan, Apr, Jul, and Oct 4 - for the second months of the quarter, i.e. Feb, May, Aug, and Nov 2 - for the third months of the quarter, i.e. Mar, Jun, Sep, and Dec Note that the constant is the number of dates on the first row of the month in the calendar. This is also the date of the first Sunday of the month.
2.	Add the constant from step 1 to the day number of the day of the week. If the given day of the week is: At his point, you may not proceed to steps 3 and 4 anymore. You may work out mentally what the date will be by using 7, 14, 21, or 28 to get the date of the nth day of the week of the month.
3.	Determine the date for the first day of the week of the month. If the sum in step 2 is more than 7, subtract 7. If the sum in step 2 is less than 7, use this value as the first day of the week of the month.

Note: Be sure that the sum does not exceed the maximum number of days for the month as shown in the above table.

If the given day of the week is				Mon	Tue		Wed	Thu		Fri	Sat		Sun
Then, add				1	2		3	4		5	6		7

4.	To the sum derived in step 2 or the difference in step 3, add the following value to the nth week.
Add		0	7			14			21			28
For the		1st Week	2nd Week			3rd Week			4th Week			5th Week

Sample illustrations

Step	1		2			3	4
Find date	Month	Constant	Day of the Week	Day Number	Sum of C & E	Diff (F-7) or F	Nth Week	Value of Nth Week	Sum of G & I	Date Derived
A	B	C	D	E	F	G	H	I	J	K
2nd Wed of Apr	Apr	7	Wed	3	10	3	2nd	7	10	Apr 10
3rd Tue of Nov	Nov	4	Tue	2	6	6	3rd	14	20	Nov 20
4th Sun of Mar	Mar	2	Sun	7	9	2	4th	21	23	Mar 23

Note: The determination of the day of the week presented in the previous topic is more practical and less complicated than this determination of the date. This is presented just in case you may need it or wish to know how to do it.