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; }