Field expression , return a value from a date

message from =?Utf-8?B?aW1iYWNrZA==?= on 20 May 2004
I need to know how to return the diiference in months from two dates, please help
 
fredg replied to =?Utf-8?B?aW1iYWNrZA==?= on 20 May 2004
[Difference]=DateDiff("m",Date1,Date2)
 

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