I've this placed in my .htaccess
Options +Indexes IndexOptions -FancyIndexing
but despite -fancyindexing, it shows the alteration time. How can you disable this?
In my opinion you would like (From Apache's paperwork on IndexOptions):
This can suppress the display from the last modification date, in fancy indexing entries.
So you'll most likely want fancy indexing switched on to possess the work properly.