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<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>
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