When you run `find' after run `touch', few nsecs has passed.
You need to apply following patch to ignore it, before test the problem.

--
 static double ts_difference(struct timespec ts1,
                            struct timespec ts2)
 {
-  double d =  difftime(ts1.tv_sec, ts2.tv_sec)
-    + (1.0e-9 * (ts1.tv_nsec - ts2.tv_nsec));
+  double d =  difftime(ts1.tv_sec, ts2.tv_sec);
+  printf ("** DEBUG ** d = %f\n", d);
   return d;
 }
--

$ touch -d '1 day ago' recent ; ./find recent -mtime 0
* DEBUG * d = 0.000000

$ touch -d '1 day ago' recent ; ./find recent -mtime -0
* DEBUG * d = -86399.000000

$ touch -d '1 day ago' recent ; ./find recent -mtime +0
* DEBUG * d = 0.000000

$ touch -d '1 day ago' recent ; ./find recent -mtime 1
* DEBUG * d = 86400.000000
recent

$ touch -d '1 day ago' recent ; ./find recent -mtime -1
* DEBUG * d = 1.000000
recent

$ touch -d '1 day ago' recent ; ./find recent -mtime +1
* DEBUG * d = 86400.000000

I think this bug should block release of the next stable findutils rlease (i.e. 4.6 or whatever).

Hi,

No match with a file modified just n days ago in "-mtime".

In this case:

now : Jul 23 2010 11:36:00 000000000
file (mtime) : Jul 22 2010 11:36:00 000000000

$ find file -mtime 0
$ find file -mtime +0
$ find file -mtime -0

I expect as following.

$ find file -mtime 0
$ find file -mtime +0
file
$ find file -mtime -0

$ ./find  --version
find (GNU findutils) 4.4.2
Copyright (C) 2007 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Eric B. Decker, James Youngman, and Kevin Dalley.
Built using GNU gnulib version e5573b1bad88bfabcda181b9e0125fb0c52b7d3b
Features enabled: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION FTS() CBO(level=0)