time_setdate.c

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#include "../fb.h"
#include <sys/time.h>

int fb_hSetDate( int y, int m, int d )
{
        const int month_len[12] =
        {
                2678400, 2419200, 2678400, 2592000, 2678400, 2592000,
                2678400, 2678400, 2592000, 2678400, 2592000, 2678400
        };

        struct timeval tv;
        time_t secs;
        int i;

        if( y < 1970 )
                return -1;
        gettimeofday( &tv, NULL );
        secs = tv.tv_sec % 86400;
        tv.tv_sec = 0;
        for( i = 1970; i < y; i++ ) {
                tv.tv_sec += 31536000;
                if( ((i % 4) == 0) || ((i / 400) == 0) )
                        d++;
        }
        tv.tv_sec += (m * month_len[m-1]);
        if( ((y % 4) == 0) || ((y / 400) == 0) )
                d++;
        tv.tv_sec += (d * 86400) + secs;
        if( settimeofday( &tv, NULL ) )
                return -1;

        return 0;
}