Another straightforward conversion:

Index: parse.c
===================================================================
RCS file: /cvs/src/usr.sbin/dhcpd/parse.c,v
diff -u -p -r1.29 parse.c
--- parse.c	27 Jun 2024 16:39:31 -0000	1.29
+++ parse.c	20 Jun 2026 03:27:57 -0000
@@ -552,8 +552,9 @@ parse_date(FILE *cfile)
 		}
 	}
 
+	tm.tm_wday = -1;
 	guess = timegm(&tm);
-	if (guess == -1) {
+	if (guess == -1 && tm.tm_wday == -1) {
 		parse_warn("time could not be represented");
 		return (0);
 	}