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 -- timestamp' )

monday ( timestamp -- timestamp' )

tuesday ( timestamp -- timestamp' )

wednesday ( timestamp -- timestamp' )

thursday ( timestamp -- timestamp' )

friday ( timestamp -- timestamp' )

saturday ( timestamp -- timestamp' )


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

start-of-month ( timestamp -- timestamp' )

start-of-week ( timestamp -- timestamp' )

midnight ( timestamp -- timestamp' )

noon ( timestamp -- timestamp' )