As someone (Simon, I think) explained, leap years are valid only for the Gregorian calendar. Great Britain (and the colonies by extension) only adopted the Gregorian calendar sometime in the 1700's (forget the exact year). Until that adoption the English-speaking world (or that part of it under British dominion, anyway) used the Julian calendar.
Was the Russian Revolution the "October Revolution" or the "November Revolution"? Prior to the Communist takeover Russia used the Julian calendar, as did most (all?) primarily Greek Orthodox countries. But I think that Greece, etc., have adopted the Gregorian calendar even though it is still, primarily, a Greek Orthodox country. As Lenin, perhaps, reasoned, it just made life a whole lot easier if everyone was on the same page. Other religions and cultures may have their own calendar rules, but in the international scheme of things the Gregorian calendar usually prevails.
So, yeah, I guess they're optional - if you want to write some new, complicated date conversion routine(s) that, for example, pass in the following:
Incoming date method (Gregorian, Vietnamese, Chinese, etc.)
Date method to convert to (see above)
Date value
And return the To-Date Value.
Seems a bit complicated, but if put into a service program, should be maintainable as one has to add new conversion routes.
Jerry C. Adams
IBM System i Programmer/Analyst
B&W Wholesale
office: 615-995-7024
email: jerry@xxxxxxxxxxxxxxx
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Jonathan Mason
Sent: Saturday, May 10, 2008 9:22 AM
To: 'RPG programming on the AS400 / iSeries'
Subject: RE: Determine birth date 6s0 format
Does that mean leap years are optional for non-Roman Catholics?
:-)
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Jerry Adams
Sent: 10 May 2008 14:28
To: RPG programming on the AS400 / iSeries
Subject: RE: Determine birth date 6s0 format
The rule for leap years, imposed by Pope Gregory VII, is
If the year is evenly divisible by 4 it is a leap year - unless
The year is also evenly divisible by 100 (such as 1900) - but
It is a leap year if the year is evenly divisible by 400 (such as
2000).
Jerry C. Adams
IBM System i Programmer/Analyst
B&W Wholesale
office: 615-995-7024
email: jerry@xxxxxxxxxxxxxxx
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Florin Todor - YYZ Concord
Sent: Friday, May 09, 2008 1:05 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Determine birth date 6s0 format
Lim, your example is not the best one; if Feb. 29 is valid for specific
year, it is valid for the (year-100); the opposite is, also, true...
I thing there is only one exception to this rule, the year 1900 (which,
if I'm not mistaken, it wasn't a leap year, but 2000 it was...)
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Lim Hock-Chai
Sent: Friday, May 09, 2008 1:21 PM
To: Lim Hock-Chai; RPG programming on the AS400 / iSeries
Subject: RE: Determine birth date 6s0 format
Umm. The opposite could be true also. Fed 29 might not be valid for
2037 but it is for 1937.
Well, have fun!!!.
-----Original Message-----
From: Lim Hock-Chai
Sent: Friday, May 09, 2008 12:17 PM
To: 'RPG programming on the AS400 / iSeries'
Subject: RE: Determine birth date 6s0 format
Date is always tricky. When doing the subtracting 100 logic, you might
want to convert the date to a ISO 8 digits numeric field first.
Subscriber this 8 digits numeric field by 100 and check the date to make
sure it is still valid before use it.
Feb 29 might be valid for 2037 and not valid for 1937.
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of DLee@xxxxxxxx
Sent: Friday, May 09, 2008 12:06 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re:Determine birth date 6s0 format
Thanks all;
I had actually "doodled" with the concept of subtracting 100 from the
date, but wasn't sure if this was an accepted way to go.
Thanks for all your help.
Darrell Lee
Information Technology
Extension 7127
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