Definition of date-plum:
(n) :
A specific day in time at which a transaction or event takes place, or is appointed to take place; a given point of time.
(n) :
A pre-arranged meeting.
(n) :
One's companion for social activities or occasions, especially a romantic partner.
(n) :
A romantic meeting or outing with a lover or potential lover, or the person so met.
(n) :
The addition to a writing, inscription, coin, etc., which specifies the time (especially the day, month, and year) when the writing or inscription was given, executed, or made.
(n) :
A point in time.