Help says @fileage accepts u argument

#3
It seems to work here, even if "u" is the entire second parameter. Below it (correctly) shows a 5 hour difference between local time and UTC.

Code:
v:\> set local=%@fileage[avetemp.txt,w]
 
v:\> set utc=%@fileage[avetemp.txt,wu]
 
v:\> echo %local
129725237365434159
 
v:\> echo %utc
129725417365434159
 
v:\> echo %@eval[(%utc - %local) / (10000000 * 60 * 60)]
5