// day_of_week -
// Returns the day of week.
// Taken from PHP source code.
static int day_of_week ( int year, int month, int day, int iso )
{
int c1, y1, m1, dow ;
c1 = century_value ( year / 100 ) ;
y1 = positive_mod ( year, 100 ) ;
m1 = IS_LEAP ( year ) ? leap_year_table [ month ] : nonleap_year_table [ month ] ;
dow = positive_mod ( ( c1 + y1 + m1 + ( y1 / 4 ) + day ), 7) ;
if ( iso )
{
if ( ! dow )
dow = 7 ;
}
return ( dow ) ;
}
static timelib_sll timelib_day_of_week_ex(timelib_sll y, timelib_sll m, timelib_sll d, int iso)
{
timelib_sll c1, y1, m1, dow;
/* Only valid for Gregorian calendar, commented out as we don't handle
* Julian calendar. We just return the 'wrong' day of week to be
* consistent. */
c1 = century_value(y / 100);
y1 = (y % 100);
m1 = timelib_is_leap(y) ? m_table_leap[m] : m_table_common[m];
dow = (c1 + y1 + m1 + (y1 / 4) + d) % 7;
if (iso) {
if (dow == 0) {
dow = 7;
}
}
return dow;
}