出来た! ありがとう >>671　でも、うーん、そういう物なのか...
$ diff time-test2-old.c time-test2.c
5a6
> #include <string.h>
20c21,22
< char *s_start = asctime(tp_start);
---
> char s_start[1024];
> strcpy(s_start, asctime(tp_start));