ARISTEAN 
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. 
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 
Diff 
Nth Week 
Value of Nth Week 
Sum of 
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. 
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