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<!DOCTYPE HTML PUBLIC>
<html>
<title>Xbase DBMS Chapter 15</title>
<body bgcolor=#FFFFFF>
<h1><p align="center">xbDate Methods</p></h1>
<p align="center">Chapter Updated 8/21/03</p><hr><br>
 
This chapter lists the xbDate methods and provides an example program to demonstrate usage.<br>
Xbase .DBF files and the xbDate class handle dates in the format of CCYYMMDD (Date8).<br><br><br> 

<center>
<table border>
<caption align=top><h3>xbDate Method List API</h3></caption>

<tr><th align=left>Method<td>Description

<tr><th align=left>xbDate( const char * Date8 )<br>xbDate( const xbString & Date8 )<br>xbDate()
  <td>Class constructors. If no date provided, or invalid date provided, date is set to Sysdate().

<tr><th align=left>~xbDate()<td>Class destructor

<tr><th align=left>xbString & CharDayOf( const char *Date8 )<br>
  xbString & CharDayOf( const xbString & Date8 )<br>xbString & CharDayOf()
  <td>Returns <em>Sun - Sat</em> day of week for a given date

<tr><th align=left>xbString & CharMonthOf( const char *Date8 )<br>xbString & CharMonthOf( const xbString & Date8 )<br>
  xbString & CharMonthOf()<td>Returns <em>Jan - Dec</em> month of year for a given date

<tr><th align=left>int DateIsValid( const char *Date8 ) const<br>int DateIsValid( const xbString & Date8 ) const
  <td>Checks a date for validity, returns true (1) if date is valid

<tr><th align=left>int DayOf( int Format, const char *Date8 ) const<br>int DayOf( int Format, const xbString &Date8 ) const<br>
  int DayOf( int Format ) const<td>Returns day of WEEK, MONTH or YEAR from a given date where <em>Format</em> is one of<br>
  <em>XB_FMT_WEEK</em> => Number of day in week 0-6 (sun-Sat)<br>
  <em>XB_FMT_MONTH</em> => Number of day in month 1-31<br>
  <em>XB_FMT_YEAR</em> => Number of day in year 1-366

<tr><th align=left>xbString & Formatdate( const char * Format, const char * Date8 )<br>
  xbString & FormatDate( const xbString & Format, const char * Date8 )<br>
  xbString & FormatDate( const char * Format, const xbString & Date8 )<br>
  xbString & FormatDate( const xbString & Format, const xbString & Date8 )<br>
  xbString & FormatDate( const xbString & Format )<br>
  xbString & FormatDate( const char * )<br>
  
  <td>Return a formatted date.<br>

      Format - A format specifier with the following paramaters:<br>

        1) YYDDD    -  A julian date format<br>

        2) YY or YYYY will print a 2 or 4 digit year<br>

        3) M,MM,MMM or MMMM<br>

           M    - one digit month if no leading zero<br>
           MM   - two digit month, contains leading zero<br> 
           MMM  - Jan through Dec<br>
           MMMM - January through December<br>

        4) D,DD,DDD or DDDD<br>
   
           D    - one digit dayif no leading zero<br>
           DD   - two digit day, contains leading zero <br>
           DDD  - Sun through Sat (or julian if YYDDD)<br>
           DDDD - Sunday through Saturday<br>


<tr><th align=left>const xbString & GetDate() const<br>xbString & GetDate()<td>Return date

<tr><th align=left>const xbString & GetFormattedDate() const<br>xbString & GetFormattedDate()<td>
  Returns formatted date.  See notes on format paramaters.

<tr><th align=left>int IsLeapYear( const char *Date8 ) const<br>int IsLeapYear( const xbString &Date8 ) const<br>
  int IsLeapYear() const<td>Returns true if given date is a leap year

<tr><th align=left>long JulianDays( const char *Date8 ) const<br>long JulianDays( const xbString & Date8 ) const<br>
  long JulianDays() const<td>Returns number of days since 1/1/0100 to given date

<tr><th align=left>xbString & JulToDate8( long )<td>Converts julian based date to CCYYMMDD format.

<tr><th align=left>xbString & LastdayOfMonth( const char *Date8 )<br>xbString & LastDayOfMonth( const xbString & Date8 )<br>
  xbString & LastDayOfMonth()<td>Returns the Date8 format of the last day of the month for a given date

<tr><th align=left>int MonthOf( const char *Date8 ) const<br>int MonthOf( const xbString &Date8) const<br>
int MonthOf() const<td>Returns month of a date

<tr><th align=left>int SetDate( const char * Date8 )<br>int SetDate( const xbString & Date8 )<td>
  Sets the xbDate to <em>Date8</em>. Return 1 on success, 0 on error.
  
  
<tr><th align=left>xbString & Sysdate()<td>This method sets the class date and returns the system date

<tr><th align=left>int YearOf( const char *Date8 ) const<br>int YearOf( const xbString &Date8 ) const<br>
int YearOf() const<td>Returns century and year of a date

<tr><th align=left>xbString &operator+=( int )<td>+= operator
<tr><th align=left>xbString &operator-=( int )<td>-= operator
<tr><th align=left>xbString &operator++( int )<td>++ operator
<tr><th align=left>xbString &operator--( int )<td>-- operator
<tr><th align=left>xbString &operator+( int )<td>+ operator
<tr><th align=left>xbString &operator-( int )<td>- operator
<tr><th align=left>long operator-( const xbDate & ) const<td>- operator
<tr><th align=left>int operator==( const xbDate & ) const<td>== operator
<tr><th align=left>int operator!=( const xbDate & ) const<td>!= operator
<tr><th align=left>int operator<( const xbDate & ) const<td>< operator
<tr><th align=left>int operator>( const xbDate & ) const<td>> operator
<tr><th align=left>int operator<=( const xbDate & ) const<td><= operator
<tr><th align=left>int operator>=( const xbDate & ) const<td>>= operator

</table></center>
<br><br><br>

<h2>Sample program</h2><br>
The source for this program is in the libtest directory. <br><br>

<xmp>
    Xbase project source code

    This program tests the xdate routines 

    Copyright (C) 1997  Gary A. Kunkel   

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Contact:

      Mail:
  
        Technology Associates, Inc.
        XBase Project
        1455 Deming Way #11
        Sparks, NV  89434
        USA

     Email:
       
       xbase@techass.com
       xdb-devel@lists.sourceforge.net
       xdb-users@lists.sourceforge.net

     Website:

       xdb.sourceforge.net


    This program tests and demonstrates usage of the various xbDate methods

    Several of the tests pass either StringDate or Chardate to the method 
    being tested - this is done to test the class methods.  In actual usage, 
    this may not be necessary due to the instance of the class already 
    containing a date value.  
*/

#include "xbase.h"

int main()
{
   xbString StringDate( "19601007" );      /* oct 7 1960 */
   char     CharDate[9] = "19611109";      /* nov 9 1961 */

   xbDate d1;                              /* today is default   */
   xbDate d2( StringDate );                /* from string data   */ 
   xbDate d3( CharDate );                  /* from char data     */
   xbDate d4;                              /* another date class */

   std::cout << "This program tests the XDATE routines" << std::endl;
   std::cout << "Date 1 (Sysdate) is    " << d1.GetDate() << std::endl;
   std::cout << "Date 2 (StringDate) is " << d2.GetDate() << std::endl;
   std::cout << "Date 3 (CharDate) is   " << d3.GetDate() << std::endl;

   std::cout << "This year is  " << d1.YearOf() << std::endl;
   std::cout << "Year of xbString Date is " <<  d2.YearOf( StringDate )
             << std::endl;
   std::cout << "Year of char Date is "     <<  d3.YearOf( CharDate )
             << std::endl;

   std::cout << "This Month is " << d1.MonthOf() << std::endl;
   std::cout << "Month of xbString Date is " <<  d2.MonthOf( StringDate )
             << std::endl;
   std::cout << "Month of char Date is "     <<  d3.MonthOf( CharDate )
             << std::endl;

   std::cout << "Today is day " << d1.DayOf( XB_FMT_WEEK ) << " of the week"
             << std::endl; 
   std::cout << "StringDate is day " << d2.DayOf( XB_FMT_MONTH, StringDate )
             << " of the month" << std::endl;
   std::cout << "CharDate is day " << d3.DayOf( XB_FMT_YEAR, CharDate )
             << " of the year" << std::endl;

   if( d1.IsLeapYear())
      std::cout << "This is a leapyear" << std::endl;
   else
      std::cout << "This is not a leap year." << std::endl;
 
   if( d2.IsLeapYear( StringDate ))
      std::cout << "StringDate is a leapyear" << std::endl;
   else
      std::cout << "StringDate is not a leap year." << std::endl;
 
   if( d3.IsLeapYear( CharDate ))
      std::cout << "CharDate is a leapyear" << std::endl;
   else
      std::cout << "CharDate is not a leap year." << std::endl;
 
   std::cout << "Today is " << d1.Sysdate() << std::endl;

   if( d1.DateIsValid( "19951301" ))
      std::cout << "19951301 is a valid date" << std::endl;
   else
      std::cout << "19951301 is not a valid date" << std::endl;

   if( d1.DateIsValid( "19920229" ))
      std::cout << "19920229 is a valid date" << std::endl;
   else
      std::cout << "19920229 is not a valid date" << std::endl;

   if( d2.DateIsValid( StringDate ))
      std::cout << StringDate << " is a valid date" << std::endl;
   else
      std::cout << StringDate << " is not a valid date" << std::endl;

   std::cout << "Today's Julian date " << d1.JulianDays() << std::endl;
   std::cout << "StringDate Julian date " << d2.JulianDays( StringDate )
             << std::endl;

   std::cout << "There are "
             << ( d1.JulianDays( "19951101" ) - d1.JulianDays( "19951001" ))
             << " days between 10/1/95 and 11/1/95." << std::endl;

   std::cout << "Todays Julian date (Number of days since Jan 1 0100):"
             << d1.JulianDays() << std::endl; 

   d4 = d1;    // set d4 class = to sysdate 
   std::cout << "Object d4 initialized to " << d4.GetDate() << std::endl;
   std::cout << "This should be todays date: "  
             << d4.JulToDate8(d4.JulianDays()) << std::endl;
   std::cout << "In 7 days it will be "  
             << d4.JulToDate8(d4.JulianDays() + 7L ) << std::endl;

   std::cout << "Today is " << d1.CharDayOf() << std::endl;
   std::cout << "StringDate day is " << d2.CharDayOf( StringDate )
             << std::endl;
   std::cout << "This month is " << d1.CharMonthOf() << std::endl;
   std::cout << "StringDate month is " << d2.CharMonthOf() << std::endl;


   /* various format routines using different formats, strings and chars */
   xbString xbStFmt( "MM/DD/YY" );
   std::cout << "Format (YYDDD)     " << d1.FormatDate( "YYDDD" ) << std::endl;
   std::cout << "Format (MM/DD/YY)  " << d1.FormatDate( xbStFmt ) << std::endl;
   xbStFmt = "DD/MM/YY";
   std::cout << "Format (DD/MM/YY)  " << d1.FormatDate(xbStFmt, "19730110")
             << std::endl;
   std::cout << "Format (MMMM DD,YYYY)    "
             <<  d1.FormatDate( "MMMM DD,YYYY", d1.GetDate()) << std::endl;
   xbStFmt = "DDDD, MMMM DD YYYY";
   std::cout << "Format (DDDD, MMMM DD YYYY) "
             <<  d2.FormatDate( xbStFmt, d2.GetDate()) << std::endl;

   std::cout << "Last day this month " << d1.LastDayOfMonth() << std::endl;
   std::cout << "Last day of month for StringDate is "
             << d2.LastDayOfMonth( d2.GetDate()) << std::endl;

   std::cout << "Overloaded operators test..." << std::endl;

   if( d1 == d2 )
     std::cout << d1.GetDate() << " is equal to " << d2.GetDate()
               << std::endl;
   else
     std::cout << d1.GetDate() << " is not equal to " << d2.GetDate()
               << std::endl;

   if( d1 != d3 )
     std::cout << d1.GetDate() << " is not equal to " << d3.GetDate()
               << std::endl;
   else
     std::cout << d1.GetDate() << " is equal to " << d3.GetDate()
               << std::endl;
     
   if( d1 < d2 )
     std::cout << d1.GetDate() << " is less than " << d2.GetDate()
               << std::endl;
   else
     std::cout << d1.GetDate() << " is not less than " << d2.GetDate()
               << std::endl;
     
   if( d1 > d2 )
     std::cout << d1.GetDate() << " is greater than " << d2.GetDate()
               << std::endl;
   else
     std::cout << d1.GetDate() << " is not greater than " << d2.GetDate()
               << std::endl;
     
   if( d1 <= d2 )
     std::cout << d1.GetDate() << " is less than or equal to " << d2.GetDate()
               << std::endl;
   else
     std::cout << d1.GetDate() << " is not less than or equal to "
               << d2.GetDate() << std::endl;
     
   if( d1 >= d2 )
     std::cout << d1.GetDate() << " is greater than or equal to "
               << d2.GetDate() << std::endl;
   else
     std::cout << d1.GetDate() << " is not greater than or equal to "
               << d2.GetDate() << std::endl;

   d1.Sysdate();
   d1++;
   std::cout << "Tomorrow is " << d1.GetDate() << std::endl;
   d1-=2;
   std::cout << "Yesterday was " << d1.GetDate() << std::endl;
   std::cout << "There are " << d1 - d2 << " days between " << d1.GetDate() 
             << " and " << d2.GetDate() << std::endl;

   return 0;
}
    

</xmp>
<hr>
<p><img src="xbase.jpg"><br><hr>
</BODY>
</HTML>