Relative timestamps
Calendar

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In the future:
hence ( duration -- timestamp )


In the past:
ago ( duration -- timestamp )


Invert a duration:
before ( duration -- -duration )


Days of the week relative to now:
sunday ( timestamp -- new-timestamp )

monday ( timestamp -- new-timestamp )

tuesday ( timestamp -- new-timestamp )

wednesday ( timestamp -- new-timestamp )

thursday ( timestamp -- new-timestamp )

friday ( timestamp -- new-timestamp )

saturday ( timestamp -- new-timestamp )


New timestamps relative to calendar events:
beginning-of-year ( object -- new-timestamp )

beginning-of-month ( timestamp -- new-timestamp )

beginning-of-week ( timestamp -- new-timestamp )

midnight ( timestamp -- new-timestamp )

noon ( timestamp -- new-timestamp )