/* $NetBSD: ymd2yd.c,v 1.1.1.1 2000/03/29 12:38:50 simonb Exp $ */ /* * ymd2yd - compute the date in the year from y/m/d */ #include "ntp_fp.h" #include "ntp_unixtime.h" #include "ntp_stdlib.h" /* * Tables to compute the day of year from yyyymmdd timecode. * Viva la leap. */ static int day1tab[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; static int day2tab[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int ymd2yd( int y, int m, int d ) { int i, *t; if (m < 1 || m > 12 || d < 1) return (-1); if (((y%4 == 0) && (y%100 != 0)) || (y%400 == 0)) t = day2tab; /* leap year */ else t = day1tab; /* not a leap year */ if (d > t[m - 1]) return (-1); for (i = 0; i < m - 1; i++) d += t[i]; return d; }