@MAKEAGE

@MAKEAGE[date[,time]]:  Returns the date and time (if included) as a 
single value in the same format as @FILEAGE.  @MAKEAGE can be used to 
compare the time stamp of a file with a specific date and time, for 
example: 

        if %@fileage[myfile] lt %@makeage[1/1/85] echo OLD!

The value returned by @MAKEAGE can be used for comparisons, but can not be 
used for date and time calculations because it is not in identifiable 
units.