There used to be a time when people wrote letter, which means that they write something on a piece of paper and send it by post. This custom is almost lost in our modern times. Nowadays messages are sent by email and the date is set by the computer. However, we would like to present this in case you feel bound to tradition.
An example
infos24 GmbH
internet service
Stephanstraße 11
10559 Berlin
An das
Einwohnermeldeamt
Schönhauser Allee 134
13123 Berlin
Sehr geehrte Damen und Herren,
...
Mit freundlichen Grüßen
Andrés Ehmann
Berlin,
(den) 23.04.2002
infos24 GmbH
internet service
Stephanstraße 11
10559 Berlin
An das
Einwohnermeldeamt
Schönhauser Allee 134
13123 Berlin
Dear Sirs,
...
Yours sincerly
Andrés Ehmann
Berlin,
April 23, 2002
The date is put in red. If you now wonder what is meant with den please note that it is not necessary to use it anymore. This den can be explained with historic reasons. This den
is an Akkusativ that refers to Tag.
But this Tag is lost.
The same phenomenon we can find with Guten
Tag , Guten Morgen (Good morning). In these phrases one could ask why it is not Guter
Tag. The explication is the same. This Guten
Tag is the remains of a whole phrase, Ich
wünsche Ihnen einen guten Tag. With this it is quite clear that Guten Tag
is an Akkusativ.