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-<!DOCTYPE HTML PUBLIC>
-<HTML>
-<TITLE>Xbase DBMS Chapter 4</TITLE>
-<BODY BGCOLOR=#FFFFFF>
-<H1><p align="center">Date Processing</p></H1>
-<p align="center">Chapter Updated 12/09/22</p><hr>
-
-The objective of this chapter is to provide information regarding 
-the basic concepts of date arithmetic and supply generic
-C/C++ date methods.<br><br>
-
-<h2>Leap Years</h2>
- 
-Due to the fact that it actually takes about 365 1/4 days for 
-the earth to circle the sun,  every fourth year and every fourth 
-century have an extra day added to the end of February and the year 
-is called a leap year. Leap years have 366 days, non leap years 
-have 365 days.  The following code segment describes how to
-determine if a given year is a leap year.
-
-A leap year is a year having 366 days, which can be evenly
-divisible by 4 and not by 100 or divisible by 400.
-
-There are also leap centuries.  Leap centuries are years which 
-are evenly divisible by 400.
-
-To calculate a leap year, the following code segment can be used
-
-<xmp>    
-   int year;
-        
-   if(( year % 4 == 0 && year % 100 != 0 ) || year % 400 = 0 )
-      LEAP_YEAR = TRUE;
-   else
-      LEAP_YEAR = FALSE
-</xmp>    
-                    
-
-<h2>Julian Dates</h2>
-   
-Around the time of Jesus Christ, a fellow with the name of Julias Ceasar
-established the Julian calendar.  The Julian calendar established every 
-fourth year as a leap year with 366 days and all other years having 365 days. 
-The months were set up the same as they are with a Gregorian calendar, which
-is what we use today.  A Julian date is defined as as the number of days from the
-first day of the year; February 1 would have a Julian day of 32.<br><br>
-
-From a programmer's perspective, Julian dates are useful for doing date 
-arithmetic, determining the difference between two dates or calculating
-a future or past date.<br><br>
-        
-To determine the difference between two dates,  convert both dates to a 
-Julian date and subtract one from the other.<br><br>
-
-To calculate a future or past date, convert the base date to a Julian date,
-add (or subtract) the number of days necessary to (from) it and convert the
-julian date back to a Gregorian date.<br><br>
-
-The Julian date routines use a base date of 01/01/0001. DBase julian Dates have an offset of 1721425L, reason unknown.
-<br><br>
-
-<h2>Gregorian Dates</h2>
-
-In 1582, Pope Gregor XIII introduced a corrected form of the Julian calendar.
-Every 4th year still has 366 days except for century years.  Century years
-were added as leap years if evenly divisible by 400.  The year 2000 is a leap century. 
-<br><br>
-
-The methods supplied with this software are based on gregorian dates with
-the format of CCYYMMDD for century, year, month and day.<br><br>
-
-
-<h2>Date Formats</h2>
-
-All dates are stored in the .DBF files with format CCYYMMDD.<br><br>
-All date routines work with dates formated with the same CCYYMMDD format.<br><br>
-
-<hr>
-<p><img src="xbase.jpg"><br><hr>
-</BODY>
-</HTML>