At the Archives Hub (http://archiveshub.ac.uk/) we require dates to be normalised at all levels, as this is how our software searches them.
We do have the capacity to normalise dates if descriptions are sent without the normalised version.
Archives Hub Support
I'd like to take a quick and extremely informal survey. How many institutions are normalizing dates at the file level? My past institution only normalized dates at the top, series, and subseries levels. The rational was that it's not worth the time to normalize at the file level because there aren't enough publishing options available that utilize the data. (Plus, there's a script to normalize dates if it's needed.) My current institution is looking at best practices for our encoding and I'd be interested to hear what others are doing .