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  • Subject: Re: Leap Year
  • From: Rob Berendt <rob@xxxxxxxxx>
  • Date: Wed, 26 Aug 1998 13:21:56 -0500

Why not use a routine that uses the new date functions within RPGILE?  I 
realize that some canned software shies away from true date fields.  SSA does 
because other databases either didn't support true date fields or had some 
bugs.  You could either use a call, if your original program is non ILE or use 
a procedure if it is.  The RPGILE functions available include, (as cut from the 
RPG ILE reference manual):
$   "ADDDUR (Add Duration)" in topic 4.4.3
 
$   "EXTRCT (Extract Date/Time/Timestamp)" in topic 4.4.40
 
$   "SUBDUR (Subtract Duration)" in topic 4.4.90
 
$   "TEST (Test Date/Time/Timestamp)" in topic 4.4.93
 
 
With "ADDDUR (Add Duration)" in topic 4.4.3 you can add a duration to a date or 
time. 
With "SUBDUR (Subtract Duration)" in topic 4.4.90 you can subtract a duration 
from a 
date or time, or calculate the duration between 2 dates, times or timestamps. 
With 
"EXTRCT (Extract Date/Time/Timestamp)" in topic 4.4.40 you can extract part of 
a 
date, time or timestamp. With "TEST (Test Date/Time/Timestamp)" in topic 4.4.93 
you 
can test for a valid date, time, or timestamp field. 




venu_yamajala@goodyear.com on 08/26/98 12:05:32 PM
Please respond to MIDRANGE-L@midrange.com@Internet
To:     MIDRANGE-L@midrange.com@Internet
cc:      
Subject:        Leap Year

Hi All,

 I want to know the fool-proof method of determining the leap year
technique. My earlier logic was :

Divide CCYY by 400.
If divisible then it is leap year, else
Divide CCYY by 100.
If divisible then it is leap year, else
Divide CCYY by 4.
If divisible, then it is leap year, else it is not a leap year.

But this is not working for years 1900, 1800, 1700, 2100...etc. Sometime back
someone in a meeting pointed out that though 1900...etc are divisible by 100, 4
they are not leap years!!! I heard someone saying that for every 400 turns of
the century (means years with 1600, 2000, 2400...etc), they are leap years and
all other 100s are not (1900, 1800..etc). With this variation in mind, I am
coming out with a new algorithm that says :

Divide CCYY by 400.
If divisible then it is a leap year, else
Divide CCYY by 4
If divisible then it is a leap year, else it is not a leap year.

 I want to know from the list, whether this new variation is the
fool-proof technique. If not, I would like to know the one.
Thanx in advance for any suggestions.

Rgds
Vg
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