--- datebook.c.orig	Fri Feb 25 02:33:24 2000
+++ datebook.c	Thu May  4 14:39:30 2000
@@ -382,7 +382,7 @@
    int isdst;
    
    isdst = tm1->tm_isdst;
-   tm1->tm_isdst = 0;
+   tm1->tm_isdst = -1;
    t1 = mktime(tm1);
    if (-1 == adj) {
       gmt = gmtime(&t1);
