Move unfinished (or not started) tasks from the past to the current time

[GoogleCodeExporter]

I started a schedule about a week ago.  Not all tasks got completed as 
scheduled.  I tried updating "move project start date" in 
Project=>Properties=>Calendar.  

How do I leave tasks that are 100% complete right where they are and only move 
unfinished work?  Is this possible with Ganttproject or do I need to move to a 
different software?

Original issue reported on code.google.com by rugco...@gmail.com on 29 May 2013 at 11:07

[GoogleCodeExporter]

Original comment by dbarashev on 27 Jun 2013 at 10:26

• Changed title: Move unfinished (or not started) tasks from the past to the current time
• Changed state: Accepted
• Added labels: Tasks, Type-Enhancement
• Removed labels: Type-Discussion

[GoogleCodeExporter]

Another suggestion for this: when moving tasks that are partially completed, 
place the task so that only the incomplete portion is in the future.  For 
example, if today is June 28, the task's duration is 6 days and it is 50% 
complete, change its start date to June 25 so that the incomplete 50% is in the 
future.  This should help with giving more realistic completion dates.

In pseudocode:

days_completed = floor(task.duration*task.progress);

if task.progress < 100%  AND  task.start_date + days_completed < date.today
  task.start_date = date.today - days_completed;


The second condition (after AND) checks that tasks are only moved into the 
future.  days_completed is the number of days of completed work.

Original comment by Mark.Z.H...@gmail.com on 1 Jul 2013 at 10:13