-===at===
- Mark {f} :: march (region at a frontier governed by a marquess) (noun)
- Tag {m} :: day (part of a day period which one spends at one’s job, school, etc.) (noun)
- auf :: on (positioned at the upper surface of) (preposition)
- an :: on (at the date of) (preposition)
- Datum {n}, Zeitpunkt {m} :: date (point of time at which a transaction or event takes place) (noun)