Improvement to control mtime

[Евгений]

Hi,

I really miss the following feature when using TAR.

I am archiving a large set of files against a pre-formed list. Some of
these files can be modified by the user during the archive creation
process at any time. And I would like to control this situation.

For example, when creating an archive, set the modification time for
comparison. The required mtime can be set via the option. If the
modification time of a file from the archive list is newer than the
specified one, issue an appropriate warning and possibly not a zero
return code.

Can you help me?