How can I set SLA based on the date of custom field?

Question

I have a  custom field named "due day", the SLA will calculate the day from right now to the "due day" which the users pick up.

How can I do that?

Rick de Jong2 · Answer

Could you explain what you want a bit more?
You have a custom field called due day. What must it do and what does it need to accomplish this?
With "The SLA" I assume you mean the SLA metric you constructed correct? Also where must this custom field be placed. You have to be specific

ivy wang · Answer

any answers??