add-duration

Arguments: date-timespec durationspec

Returns a new date-time object obtained by adding the duration specified by durationspec to the date-time specified by date-timespec.

The default method does not add two durations.

(require :datetime)
(use-package :util.date-time)

 > (add-duration (date-time "1985-04-10T10:30:40") (duration "1MT1H4S"))
 #<date-time "1985-05-10T11:30:44" @ ...>

See duration, date-time, and subtract-duration.

See date-time.htm for information on support in Allegro CL for parsing and generating time expressions using the ISO 8601 standard. See particularly the section Adding/Subtracting Durations, where it is pointed out (with examples) that adding and subtracting durations are not inverse operations and adding durations is not associative.

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Created 2010.1.21.