int __month_to_secs(int month, int is_leap)
{
        static const int secs_through_month[] = {
                0, 31*86400, 59*86400, 90*86400,
                120*86400, 151*86400, 181*86400, 212*86400,
                243*86400, 273*86400, 304*86400, 334*86400 };
        int t = secs_through_month[month];
        if (is_leap && month >= 2) t+=86400;
        return t;
}