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/************************************************************************/
/* */
/* Date manipulation. */
/* */
/* These routines are totally naive with respect to the difference */
/* between Julian and Gregorian dates. Everything is Gregorian. */
/* */
/* Dates are relative to the hypothetical date 'Mar 1 0000', then */
/* shifted to be relative to Jan 1, 1970. */
/* */
/************************************************************************/
# include <utilDate.h>
# include <appDebugon.h>
static int UTIL_DateMdays[]=
{
0,
31, /* 31, Mar */
61, /* 30, Apr */
92, /* 31, May */
122, /* 30, Jun */
153, /* 31, Jul */
184, /* 31, Aug */
214, /* 30, Sep */
245, /* 31, Oct */
275, /* 30, Nov */
306, /* 31, Dec */
337, /* 31, Jan */
366, /* 29, Feb */
};
# define Y1 ( 365 )
# define Y4 ( 4* Y1+ 1 )
# define Y100 ( 24* Y4+ 4* Y1 )
# define Y400 ( 4* Y100+ 1 )
# define JAN_1_1970 ( 719468 )
long utilDateGregorianDayNumber( int year,
int month,
int day )
{
long rval= 0;
month -= 3;
while( month < 0 )
{ month += 12; year--; }
while( month >= 12 )
{ month -= 12; year++; }
rval += Y400* (year/400); year= year % 400;
rval += Y100* (year/100); year= year % 100;
rval += Y4 * (year/4 ); year= year % 4 ;
rval += Y1 * year;
rval += UTIL_DateMdays[month];
rval += day- 1;
return rval- JAN_1_1970;
}
void utilDateSplitGregorianDate( long day,
int * pYear,
int * pMonth,
int * pDay )
{
int year= 0;
int month= 0;
int s;
if ( day < -JAN_1_1970 )
{ LLDEB(day,JAN_1_1970); }
day += JAN_1_1970;
while( day >= Y400 ) { year += 400; day -= Y400; }
s= 0;
while( day >= Y100 && s < 3 ) { year += 100; day -= Y100; s++; }
while( day >= Y4 ) { year += 4; day -= Y4; }
s= 0;
while( day >= Y1 && s < 3 ) { year += 1; day -= Y1; s++; }
day++;
while( UTIL_DateMdays[month+1] < day &&
month < 12 )
{ month++; }
day -= UTIL_DateMdays[month];
month += 3;
if ( month > 12 )
{ month -= 12; year++; }
*pYear= year;
*pMonth= month;
*pDay= day;
return;
}
# if 0
# include <time.h>
extern int qqq(void);
int qqq(void)
{
long value;
int year;
int month;
int day;
LDEB(utilDateGregorianDayNumber(1970,1,1));
for ( value= -JAN_1_1970+ 1; value < 3670000; value++ )
{
long value2;
utilDateSplitGregorianDate( value, &year, &month, &day );
value2= utilDateGregorianDayNumber( year, month, day );
if ( value2 != value )
{
LLLDEB(year,month,day);
LLDEB(value2,value);
return 1;
}
}
utilDateSplitGregorianDate( value, &year, &month, &day );
LLLDEB(year,month,day);
for ( value= -23000; value < 23000; value++ )
{
time_t t= 24* 60* 60* value;
struct tm * tm= gmtime( &t );
utilDateSplitGregorianDate( value, &year, &month, &day );
if ( tm->tm_year+ 1900 != year )
{
LLDEB(tm->tm_year,year);
LLLDEB(year,month,day);
LLDEB(t,value);
return 1;
}
if ( tm->tm_mon+ 1 != month )
{
LLDEB(tm->tm_mon,month);
LLLDEB(year,month,day);
LLDEB(t,value);
return 1;
}
if ( tm->tm_mday != day )
{
LLDEB(tm->tm_mday,day);
LLLDEB(year,month,day);
LLDEB(t,value);
return 1;
}
}
return 0;
}
# endif
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