**As** an OpenProject user
**I want** to calculate the work package start and end dates based on the duration
**so** that I only have to set the duration.

# **Acceptance criteria:**

* Begin of the insertionIn the date modal there isEnd of the insertion Begin of the deletion AddEnd of the deletion an Begin of the insertionform field duration.End of the insertion Begin of the deletion attribute "Duration" to work packages.End of the deletion
* Begin of the insertionWhen entering a durationEnd of the insertion Begin of the deletion InferEnd of the deletion the Begin of the insertionfinish date is calculated.
* When changing theEnd of the insertion start Begin of the insertiondate the duration remains unchanged. Thus the finished date is moved.
* When chaning theEnd of the insertion Begin of the deletion /End of the deletion finish date Begin of the insertionthe duration is reculcated. 
* In the work packages list there is a column "duration". When clickingEnd of the insertion Begin of the deletion basedEnd of the deletion on Begin of the insertionthisEnd of the insertion the Begin of the insertiondate modal with the date picker is opened.

# Visuals

<figure class="image op-uc-figure" style="width:55.55%;"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/20507/content"></div></figure>End of the insertion Begin of the deletion entered duration.End of the deletion

# Out-of-Scope

* Consider weekends and holidays (##18416)