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-/* xbdate.cpp
-
- Xbase64 project source code
-
- These functions are used for processing dates.
- All functions assume a standard date format of CCYYMMDD
- for Century,Year,Month and Day
-
- Copyright (C) 1997,2003 Gary A Kunkel
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser 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:
-
- Email:
-
- xdb-devel@lists.sourceforge.net
- xdb-users@lists.sourceforge.net
-
-
- Regular Mail:
-
- XBase Support
- 149C South Main St
- Keller Texas, 76248
- USA
-
-*/
-
-#ifdef __GNU LesserG__
- #pragma implementation "xbdate.h"
-#endif
-
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#ifdef __WIN32__
-#include <xbase64/xbwincfg.h>
-#else
-#include <xbase64/xbconfig.h>
-#endif
-#include <xbase64/xbase64.h>
-#include <xbase64/xbdate.h>
-//#include <xbase64/retcodes.h>
-
-/*! \file xbdate.cpp
-*/
-
-int xbDate::DaysInMonths[2][13];
-int xbDate::AggregatedDaysInMonths[2][13];
-
-#define EPOCH_MIN 100
-#define EPOCH_MAX 3000
-#define DAYS_AD(year) ((year) *365L + (year) / 4 - (year) / 100 + (year) / 400)
-
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-xbDate::xbDate( const xbString & Date8 ) {
- if( DateIsValid( Date8 ))
- cDate8 = Date8;
- else
- Sysdate();
- SetDateTables();
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-xbDate::xbDate( const char * Date8 ) {
- if( DateIsValid( Date8 ))
- cDate8 = Date8;
- else
- Sysdate(); /* if invalid date, set class to sysdate */
- SetDateTables();
-}
-/***************************************************************/
-//! Short description.
-/*!
-*/
-xbDate::xbDate()
-{
- Sysdate();
- SetDateTables();
-}
-
-/***************************************************************/
-//! Destructor
-/*!
-*/
-xbDate::~xbDate()
-{
-}
-/***************************************************************/
-//! Short description.
-/*!
-*/
-void xbDate::SetDateTables() {
- if( AggregatedDaysInMonths[1][12] != 366 ){ /* first time called ? */
- AggregatedDaysInMonths[0][0] = 0;
- AggregatedDaysInMonths[0][1] = 31;
- AggregatedDaysInMonths[0][2] = 59;
- AggregatedDaysInMonths[0][3] = 90;
- AggregatedDaysInMonths[0][4] = 120;
- AggregatedDaysInMonths[0][5] = 151;
- AggregatedDaysInMonths[0][6] = 181;
- AggregatedDaysInMonths[0][7] = 212;
- AggregatedDaysInMonths[0][8] = 243;
- AggregatedDaysInMonths[0][9] = 273;
- AggregatedDaysInMonths[0][10] = 304;
- AggregatedDaysInMonths[0][11] = 334;
- AggregatedDaysInMonths[0][12] = 365;
- AggregatedDaysInMonths[1][0] = 0;
- AggregatedDaysInMonths[1][1] = 31;
- AggregatedDaysInMonths[1][2] = 60;
- AggregatedDaysInMonths[1][3] = 91;
- AggregatedDaysInMonths[1][4] = 121;
- AggregatedDaysInMonths[1][5] = 152;
- AggregatedDaysInMonths[1][6] = 182;
- AggregatedDaysInMonths[1][7] = 213;
- AggregatedDaysInMonths[1][8] = 244;
- AggregatedDaysInMonths[1][9] = 274;
- AggregatedDaysInMonths[1][10] = 305;
- AggregatedDaysInMonths[1][11] = 335;
- AggregatedDaysInMonths[1][12] = 366;
-
- DaysInMonths[0][0] = 0;
- DaysInMonths[0][1] = 31;
- DaysInMonths[0][2] = 28;
- DaysInMonths[0][3] = 31;
- DaysInMonths[0][4] = 30;
- DaysInMonths[0][5] = 31;
- DaysInMonths[0][6] = 30;
- DaysInMonths[0][7] = 31;
- DaysInMonths[0][8] = 31;
- DaysInMonths[0][9] = 30;
- DaysInMonths[0][10] = 31;
- DaysInMonths[0][11] = 30;
- DaysInMonths[0][12] = 31;
- DaysInMonths[1][0] = 0;
- DaysInMonths[1][1] = 31;
- DaysInMonths[1][2] = 29;
- DaysInMonths[1][3] = 31;
- DaysInMonths[1][4] = 30;
- DaysInMonths[1][5] = 31;
- DaysInMonths[1][6] = 30;
- DaysInMonths[1][7] = 31;
- DaysInMonths[1][8] = 31;
- DaysInMonths[1][9] = 30;
- DaysInMonths[1][10] = 31;
- DaysInMonths[1][11] = 30;
- DaysInMonths[1][12] = 31;
- }
-}
-
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this function returns century and year from a CCYYMMDD date */
-int xbDate::CenturyOf( const char * Date8 ) const
-{
- char Century[3];
- Century[0] = Date8[0];
- Century[1] = Date8[1];
- Century[2] = 0x00;
- return( atoi( Century ));
-}
-
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this function returns century and year from a CCYYMMDD date */
-int xbDate::YearOf( const char * Date8 ) const
-{
- char year[5];
- year[0] = Date8[0];
- year[1] = Date8[1];
- year[2] = Date8[2];
- year[3] = Date8[3];
- year[4] = 0x00;
- return( atoi( year ));
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this function returns the month from a CCYYMMDD date */
-int xbDate::MonthOf( const char * Date8 ) const
-{
- char month[3];
- month[0] = Date8[4];
- month[1] = Date8[5];
- month[2] = 0x00;
- return( atoi( month ));
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this function returns TRUE if a CCYYMMDD date is a leap year*/
-
-int xbDate::IsLeapYear( const char * Date8 ) const
-{
- int year;
- year = YearOf( Date8 );
- if(( year % 4 == 0 && year % 100 != 0 ) || year % 400 == 0 )
- return 1;
- else
- return 0;
-}
-
-/***************************************************************/
-//! Short description.
-/*!
- \param CalcYear
-*/
-/* this function returns TRUE if a CCYYMMDD date is a leap year*/
-
-int xbDate::CalcRollingCenturyForYear( int CalcYear ) const
-{
- /* this routine calculates a century for a year - it uses
- an 80/20 rolling date window to calculate the century */
-
- xbDate d;
- int ThisYear = YearOf( d.Sysdate() );
- int ThisCentury = CenturyOf( d.Sysdate() );
-
- ThisYear -= (ThisCentury * 100);
-
- if( ThisYear < 80 && CalcYear < (ThisYear+20) )
- return ThisCentury;
-
- else if( ThisYear >= 80 &&
- CalcYear < ThisYear &&
- CalcYear >= (ThisYear-80))
- return ThisCentury;
-
- else
- return ThisCentury - 1;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Format
- \param Date8
-*/
-/* this function returns the "day of" from a CCYYMMDD date */
-
-/* format = XB_FMT_WEEK Number of day in WEEK 0-6 ( Sun - Sat )
- format = XB_FMT_MONTH Number of day in MONTH 1-31
- format = XB_FMT_YEAR Number of day in YEAR 1-366
-*/
-
-int xbDate::DayOf( int Format, const char * Date8 ) const
-{
- char day[3];
- int iday, imonth, iyear, iday2;
-
- /* check for valid format switch */
-
- if( Format!=XB_FMT_WEEK && Format!=XB_FMT_MONTH && Format!=XB_FMT_YEAR )
- return XB_INVALID_OPTION;
-
- if( Format == XB_FMT_WEEK )
- {
- iday = DayOf( XB_FMT_MONTH, Date8 );
- imonth = MonthOf( Date8 );
- iyear = YearOf ( Date8 );
-
- /* The following formula uses Zeller's Congruence to determine
- the day of the week */
-
- if( imonth > 2 ) /* init to February */
- imonth -= 2;
- else
- {
- imonth += 10;
- iyear--;
- }
-
- iday2 = ((13 * imonth - 1) / 5) +iday + ( iyear % 100 ) +
- (( iyear % 100 ) / 4) + ((iyear /100 ) / 4 ) - 2 *
- ( iyear / 100 ) + 77 ;
-
- return( iday2 - 7 * ( iday2 / 7 ));
- }
-
- else if( Format == XB_FMT_MONTH )
- {
- day[0] = Date8[6];
- day[1] = Date8[7];
- day[2] = 0x00;
- return( atoi( day ));
- }
- else
- return(
- AggregatedDaysInMonths[IsLeapYear(Date8)][MonthOf(Date8)-1]+
- DayOf(XB_FMT_MONTH, Date8));
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-/* this method sets the class date & returns the system date */
-
-xbString& xbDate::Sysdate()
-{
- char dt[9];
- time_t timer;
- struct tm *tblock;
- timer = time( NULL );
- tblock = localtime( &timer );
- tblock->tm_year += 1900;
- tblock->tm_mon++;
- sprintf( dt,"%4d%02d%02d",tblock->tm_year,tblock->tm_mon,tblock->tm_mday );
- dt[8] = 0x00;
- cDate8 = dt;
- return cDate8;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this function checks a date for validity - returns 1 if OK */
-
-int xbDate::DateIsValid( const char * Date8 ) const
-{
- int year, month, day;
-
- if(!isdigit( Date8[0] ) || !isdigit( Date8[1] ) || !isdigit( Date8[2] ) ||
- !isdigit( Date8[3] ) || !isdigit( Date8[4] ) || !isdigit( Date8[5] ) ||
- !isdigit( Date8[6] ) || !isdigit( Date8[7] ) )
- return 0;
-
- year = YearOf ( Date8 );
- month = MonthOf( Date8 );
- day = DayOf ( XB_FMT_MONTH, Date8 );
-
- /* check the basics */
- if( year == 0 || month < 1 || month > 12 || day < 1 || day > 31 )
- return 0;
-
- /* April, June, September and November have 30 days */
- if(( month==4 || month==6 || month==9 || month==11 )&& day > 30 )
- return 0;
-
- /* check for February with leap year */
- if( month == 2 )
- if( IsLeapYear( Date8 ))
- {
- if( day > 29 )
- return 0;
- }
- else
- {
- if( day > 28 )
- return 0;
- }
- return 1;
-}
-
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-int xbDate::SetDate( const char * Date8 )
-{
- if( DateIsValid( Date8 ))
- {
- cDate8 = Date8;
- return 1;
- }
- return 0;
-}
-
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this returns the number of days since 1/1/EPOCH_MIN */
-long xbDate::JulianDays( const char * Date8 ) const
-{
- int year = YearOf( Date8 );
- if(( year < EPOCH_MIN ) || (year >= EPOCH_MAX))
- return XB_INVALID_DATE;
-
- long days = 0;
- for (long y = EPOCH_MIN; y < year; y++ )
- days += 365 + ( ( ( y%4==0 && y%100!=0 ) || y%400==0 ) ? 1 : 0 );
-
- days += (long) DayOf( XB_FMT_YEAR, Date8 ) -1;
-
- return days;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param days
-*/
-/* this function does the opposite of the JulianDays function */
-/* it converts a julian based date into a Date8 format */
-
-xbString& xbDate::JulToDate8( long days )
-{
- char Date8[9];
- int year, leap, month;
-
- year = EPOCH_MIN;
- leap = 0; /* EPOCH_MIN of 100 is not a leap year */
-
-/* this while loop calculates the year of the date by incrementing
- the years counter as it decrements the days counter */
-
- while( days > ( 364+leap ))
- {
- days -= 365+leap;
- year++;
- if(( year % 4 == 0 && year % 100 != 0 ) || year % 400 == 0 )
- leap = 1;
- else
- leap = 0;
- }
-
-/* this for loop calculates the month and day of the date by
- comparing the number of days remaining to one of the tables */
-
- for( month = 12; month >= 1; month-- )
- if( days >= (long)AggregatedDaysInMonths[leap][month] ) {
- days -= AggregatedDaysInMonths[leap][month];
- break;
- }
-
- sprintf( Date8, "%4d%02d%02ld", year, month+1, days+1 );
-
- Date8[8] = 0x00;
- cDate8 = Date8;
- return cDate8;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this routine returns a pointer to the day of the week(Sun-Sat)*/
-xbString& xbDate::CharDayOf( const char * Date8 )
-{
- struct tm tblock;
- char buf[25];
-
- tblock.tm_year = YearOf( Date8 ) - 1900;
- tblock.tm_mon = MonthOf( Date8 ) - 1;
- tblock.tm_mday = DayOf( XB_FMT_MONTH, Date8 );
- tblock.tm_hour = 0;
- tblock.tm_min = 0;
- tblock.tm_sec = 1;
- tblock.tm_isdst = -1;
- if( mktime( &tblock ) == -1 )
- fDate = "????";
- else
- {
- strftime( buf, 25, "%A", &tblock );
- fDate = buf;
- }
- return fDate;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this routine returns a pointer to the month */
-
-xbString& xbDate::CharMonthOf( const char * Date8 )
-{
- struct tm tblock;
- char buf[25];
-
- tblock.tm_year = YearOf( Date8 ) - 1900;
- tblock.tm_mon = MonthOf( Date8 ) - 1;
- tblock.tm_mday = DayOf( XB_FMT_MONTH, Date8 );
- tblock.tm_hour = 0;
- tblock.tm_min = 0;
- tblock.tm_sec = 1;
- tblock.tm_isdst = -1;
- if( mktime( &tblock ) == -1 )
- fDate = "????";
- else
- {
- strftime( buf, 25, "%B", &tblock );
- fDate = buf;
- }
- return fDate;
-}
-
-/***************************************************************/
-//! Short description.
-/*!
- \param indate in the format of MM/DD/YY
-*/
-/* This function formats a date and returns a pointer to a */
-/* static buffer containing the date */
-
-xbString& xbDate::FormatCTODdate( const char * indate )
-{
- xbDate d;
- char cbuf[3];
- char odate[9];
- fDate = "";
- if( indate[0] == ' ' || indate[1] == ' ' ) // empty date
- return fDate;
-
- sprintf( cbuf, "%02d",
- d.CalcRollingCenturyForYear( atoi( indate+6 )));
- odate[0] = cbuf[0];
- odate[1] = cbuf[1];
- odate[2] = indate[6];
- odate[3] = indate[7];
- odate[4] = indate[0];
- odate[5] = indate[1];
- odate[6] = indate[3];
- odate[7] = indate[4];
- odate[8] = 0x00;
-
- fDate = odate;
- return fDate;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Format
- \param Date8
-*/
-/* This function formats a date and returns a pointer to a */
-/* static buffer containing the date */
-
-xbString& xbDate::FormatDate( const char * Format, const char * Date8 )
-{
- const char *FmtPtr; /* format pointer */
- char *BufPtr; /* buffer pointer */
- char type;
- char cbuf[10];
- int type_ctr, i;
- char buf[50];
- xbString s;
-
- memset( buf, 0x00, 50 );
- if( strstr( Format, "YYDDD" ))
- {
- buf[0] = Date8[2];
- buf[1] = Date8[3];
- sprintf( buf+2, "%03d", DayOf( XB_FMT_YEAR, Date8 ));
- }
- else
- {
- BufPtr = buf;
- FmtPtr = Format;
- memset( cbuf, 0x00, 10 );
- while( *FmtPtr )
- {
- if( *FmtPtr != 'D' && *FmtPtr != 'M' && *FmtPtr != 'Y' )
- {
- *BufPtr = *FmtPtr;
- BufPtr++;
- FmtPtr++;
- }
- else
- {
- type = *FmtPtr;
- type_ctr = 0;
- while( *FmtPtr == type )
- {
- type_ctr++;
- FmtPtr++;
- }
- switch( type )
- {
- case 'D':
- if( type_ctr == 1 )
- {
- sprintf( cbuf, "%d", DayOf( XB_FMT_MONTH, Date8 ));
- strcat( buf, cbuf );
- BufPtr += strlen( cbuf );
- }
- else if( type_ctr == 2 )
- {
- cbuf[0] = Date8[6];
- cbuf[1] = Date8[7];
- cbuf[2] = 0x00;
- strcat( buf, cbuf );
- BufPtr += 2;
- }
- else
- {
- s = CharDayOf( Date8 );
- if( type_ctr == 3 )
- {
- strncat( buf, s.getData(), 3 );
- BufPtr += 3;
- }
- else
- {
- strcpy( cbuf, CharDayOf( Date8 ));
- for( i = 0; i < 9; i++ )
- if( cbuf[i] == 0x20 ) cbuf[i] = 0x00;
- strcat( buf, cbuf );
- BufPtr += strlen( cbuf );
- }
- }
- break;
-
- case 'M':
- if( type_ctr == 1 )
- {
- sprintf( cbuf, "%d", MonthOf( Date8 ));
- strcat( buf, cbuf );
- BufPtr += strlen( cbuf );
- }
- else if( type_ctr == 2 )
- {
- cbuf[0] = Date8[4];
- cbuf[1] = Date8[5];
- cbuf[2] = 0x00;
- strcat( buf, cbuf );
- BufPtr += 2;
- }
- else
- {
- s = CharMonthOf( Date8 );
- if( type_ctr == 3 )
- {
- strncat( buf, s.getData(), 3 );
- BufPtr += 3;
- }
- else
- {
- strcpy( cbuf, CharMonthOf( Date8 ));
- for( i = 0; i < 9; i++ )
- if( cbuf[i] == 0x20 ) cbuf[i] = 0x00;
- strcat( buf, cbuf );
- BufPtr += strlen( cbuf );
- }
- }
- break;
-
- case 'Y':
- if( type_ctr == 2 )
- {
- cbuf[0] = Date8[2];
- cbuf[1] = Date8[3];
- cbuf[2] = 0x00;
- strcat( buf, cbuf );
- BufPtr += 2;
- }
- else if( type_ctr == 4 )
- {
- cbuf[0] = Date8[0];
- cbuf[1] = Date8[1];
- cbuf[2] = Date8[2];
- cbuf[3] = Date8[3];
- cbuf[4] = 0x00;
- strcat( buf, cbuf );
- BufPtr += 4;
- }
- break;
-
- default:
- break;
- }
- }
- }
- }
- fDate = buf;
- return fDate;
-}
-/***************************************************************/
-//! Short description.
-/*!
- \param Date8
-*/
-/* this routine returns the Date8 format of the last day of the
- month for the given input Date8 */
-
-xbString & xbDate::LastDayOfMonth( const char * Date8 )
-{
- char tmp[9];
- sprintf( tmp, "%4.4d%2.2d%2.2d",
- YearOf( Date8 ), MonthOf( Date8 ),
- DaysInMonths[IsLeapYear(Date8)][MonthOf(Date8)]);
- cDate8 = tmp;
- return cDate8;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-xbString &xbDate::operator+=( int count )
-{
- JulToDate8( JulianDays() + count );
- return cDate8;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-xbString &xbDate::operator-=( int count )
-{
- JulToDate8( JulianDays() - count );
- return cDate8;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-xbString &xbDate::operator++( int )
-{
- *this+=1;
- return cDate8;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-xbString &xbDate::operator--( int )
-{
- *this-=1;
- return cDate8;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-xbString &xbDate::operator+( int count )
-{
- xbDate d( GetDate() );
- d+=count;
- fDate = d.GetDate();
- return fDate;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-xbString &xbDate::operator-( int count )
-{
- xbDate d( GetDate() );
- d-=count;
- fDate = d.GetDate();
- return fDate;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-long xbDate::operator-( const xbDate & d ) const
-{
- return JulianDays() - d.JulianDays();
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-int xbDate::operator==( const xbDate & d ) const
-{
- if( JulianDays() == d.JulianDays() )
- return 1;
- else
- return 0;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-int xbDate::operator!=( const xbDate & d ) const
-{
- if( JulianDays() != d.JulianDays() )
- return 1;
- else
- return 0;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-int xbDate::operator<( const xbDate & d ) const
-{
- if( JulianDays() < d.JulianDays() )
- return 1;
- else
- return 0;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-int xbDate::operator>( const xbDate & d ) const
-{
- if( JulianDays() > d.JulianDays() )
- return 1;
- else
- return 0;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-int xbDate::operator<=( const xbDate & d ) const
-{
- if( JulianDays() <= d.JulianDays() )
- return 1;
- else
- return 0;
-}
-/**********************************************************************/
-//! Short description.
-/*!
-*/
-int xbDate::operator>=( const xbDate & d ) const
-{
- if( JulianDays() >= d.JulianDays() )
- return 1;
- else
- return 0;
-}
-/**********************************************************************/
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-13 09:58:29 +0000