Delay this article by some time.
DELAY is a string, giving the length of the time. Possible values are:
weeks (`w'), months (`M'), or years (`Y');
* YYYY-MM-DD for a specific date. The time of day is given by the
variable `gnus-delay-default-hour', minute and second are zero.
* hh:mm for a specific time. Use 24h format. If it is later than this
time, then the deadline is tomorrow, else today. (fn DELAY)