Add or subtract a duration from a date

Question

Hi,
I'd like to automate the change in a "planned start" custom field (date type) of a ticket depending on the modification of the due date of this ticket, taking into account the estimated time necessary to complete the task.

Exemple :
Ticket_300, due date is Monday January the 20th.
Time tracking remaining estimate time is 1 week.

Custom filed "planned start" field is set at Monday January the 13th (1 week from the due date).

If I move the due date to January the 27th, I want the "planned start" custom field to be automatically updated to January the 20th because it has 1 week of remaining work.

=> Basically I need to subtract a duration from a date and I'm not sure it's feasible.

Especially that the field "issue.timeTracking.remainingestimate" can have multiple unit of time (week,days etc...).

Here is what I tried :

{{issue.dueDate.minusDays(issue.timeTracking.remainingestimate)}}

=> the automation works but no modification is actually made on the ticket.

Some help would be appreciated !

[EDIT]

I added a step where I converted the "issue.timeTracking.remainingestimate" variable into number of days and put it into a newly created variable called "DiffTemporelle".

Then the document suggests I can subtract a number of days from a date like that :

Which actually doesn't work...

Bill Sheboy · Answer

Hi @Vincent Dufour

For a question like this, context is important for the community to help.  Please post the following:

* what type of project is this (e.g., company-managed, team-managed, etc.), 
* an image of your complete automation rule,
* images of any relevant actions / conditions / branches,
* an image of the audit log details showing the rule execution, and
* explain what is not working as expected and why you believe that to be the case.

Until we see those...

When you want that field to update based on a change to the Due Date, the rule could trigger on a change to the Due Date.

Next, the smart value {{issue.timetracking.remainingEstimate}} is the human-readable format of the value, such as: 3d 4h

Instead use the remainingEstimateSeconds attribute and divide to use minusDays().  And so the value to use is {{issue.timetracking.remainingEstimateSeconds}} divided by the number of seconds in a day for your estimates.

Finally, this will only be accurate and a moment in time as it is based on the Due Date and the current value of Remaining Estimate.  Is that what you want to do?

Kind regards,
Bill