utility to compare 2 dir trees

[Fbsd8]

Fbsd8 wrote:
> Erich Dollansky wrote:
>> Hi,
>>
>> On Mon, 31 Dec 2012 20:45:39 -0500
>> Fbsd8 <fbsd8 at a1poweruser.com> wrote:
>>
>>> Adam Vande More wrote:
>>>> On Mon, Dec 31, 2012 at 7:23 PM, Fbsd8 <fbsd8 at a1poweruser.com>
>>>> wrote:
>>>>
>>>>> I want to compare 2 different directory trees to each other to
>>>>> locate any differences in directories and files contained there in.
>>>>>
>>>>> Any suggestions?
>>>>>
>>>> mtree(8)
>>>>
>>>
>>>  From the man page I don't see how to code mtree to compare 2
>>> different directory trees against each other.
>>
>> you can compare a directory tree which is rooted in your current
>> directory and a specified one.
>>
>> From man:
>>
>> The mtree utility compares the file hierarchy rooted in the current
>> directory against a specification read from the standard input.
>> Messages are written to the standard output for any files whose
>> characteristics do not match the specifications, or which are missing
>> from either the file hierarchy or the specification.
>>
>> Erich
>>
> 
> 
> So
> cd dir-tree1
> mtree -p dir-tree2
> 
> Do I understand you correctly?
> 
ended up trying
cd dir-tree1
mtree -c | mtree -p dir-tree2

Now this seems like it worked, except every thing was flagged for 
non-matching modification time. How do I tell it to not check 
modification time?