Hallo Knut
Auszug aus der Hilfe:
Before : type the word before followed by as much detail as possible as to the date (complete or not).
After : type the word after followed by as much detail as possible as to the date (complete or not).
Around : type the word around followed by as much detail as possible as to the date (complete or not).
Between/and : type the words between x and x with as much detail as possible as to the dates (complete or not).
Liebe Grüße
Richard