# Credit card statement dates follow pattern?

Do credit card statement/closing dates follow a pattern? I'm writing a program to compute credit card interest, and it's be useful to calculate closing dates vs entering them manually from my existing statements.

EDIT: OK, here are the actual closing dates from the cards where I couldn't divine a pattern.

``````FIA CARD SERVICES:

February 12, 2011
January 13, 2011
December 14, 2010
November 13, 2010
October 15, 2010
September 14, 2010
August 13, 2010
July 15, 2010
June 14, 2010
May 14, 2010
April 14, 2010
March 15, 2010
February 12, 2010
January 14, 2010
December 14, 2009
November 13, 2009

NATIONAL BANK:

3/6/2011
2/3/2011
1/6/2011
12/6/2010
11/5/2010
8/6/2010
7/6/2010
6/4/2010
5/6/2010
4/5/2010
3/5/2010

CITIBANK:

02/23/2011
01/25/2011
12/23/2010
11/23/2010
10/25/2010
09/23/2010
08/24/2010
07/23/2010
06/23/2010
05/25/2010
04/23/2010
03/24/2010

NMEFCU:

3/10/2011
2/7/2011
1/10/2011
12/10/2010
11/9/2010
10/10/2010
9/9/2010
8/10/2010
7/11/2010
6/9/2010
5/10/2010
4/9/2010
3/10/2010
2/8/2010
1/10/2010
12/9/2009
``````

Can someone divine a pattern for any of these? (and, yes, I realize that I'm now spending more time trying to answer this question that it would take to just manually record the dates).

EDIT: I checked w/ my card companies. For NMEFCU, adding 25 to the close date is the magic: the close date is chosen so that the due date is always on the 4th of the month. This formula almost works for FIA CARD SERVICES, but not quite. Still looking at the others, but credit cards appear to either set the close date to be constant (I didn't list those cases above) or set the due date to be constant.

EDIT: NATIONAL BANK: adding 25 days almost always is the end of the month.

``````Your payment is due on approximately the 25th of each
month. Approximately your statement cycles every 29 days.
``````

My guess: they are giving you a constant number of days between when the bill is sent and when it is due. Due dates are usually set either:

1. same date each month IE the 3rd of each month.

2. same day IE first thursday of the month.

Note: due date might vary based on weekends.

`Number of days in the month - date on bill` should be pretty constant if due date option #1 is being used. Note how Feb dates were usually earlier, since it is a shorter month.

• Thanks. I think we reached the same conclusion at the same time!
– user1731
Commented Mar 20, 2011 at 6:52
• @barry: if you believe this is the correct answer, you should accept it. (hit the check mark button under the answer score) Commented Mar 21, 2011 at 14:42
– user1731
Commented Mar 24, 2011 at 15:06
• @barry you can always become better. Go through your ticket list, and see if there are answers worth accepting :) Commented Mar 24, 2011 at 19:49

Check with your bank, usually a statement is either at the same day of month (e.g.: every 15th of the month), or every 30 days (e.g: March 15th, April 14th, May 14th, so forth).

From my experience, most credit cards use the same day of month strategy. Keep in mind that if the day is not a business day (e.g.: weekend), the statement is closed either the previous or the next business day.

• Same day of the month would be great, but most of my cards don't seem to do this. The 30 days might be what they're doing, I'll take a look.
– user1731
Commented Mar 13, 2011 at 22:43
• Well... I have several credit cards, but they all come from only 3 issuers, all of the three use the same day of month. But as I mentioned - that's only my personal experience. Commented Mar 13, 2011 at 22:47

Each bank is different. Usually in my experience for newer credit card accounts, there is a specific number of days in a billing cycle (something like 28) and then a 20-25 day grace period.

Older accounts usually have 30+ day billing cycles. Back in the 90's, many cards also had 30-40 day grace periods.

The language specific to your card is in the card agreement.

• Thanks @duffbeer703. In this case, I'm talking solely about billing cycles, not grace periods, and not due dates. I'm hoping to find some reasonable pattern.
– user1731
Commented Mar 15, 2011 at 0:25