These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/Time-Period-1.250.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 18 KiB
[ebuild  N     ] dev-perl/Time-ParseDate-2015.103.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 27 KiB
[ebuild  N     ] app-backup/dirvish-1.2.1-r1::gentoo  48 KiB

Total: 3 packages (3 new), Size of downloads: 92 KiB