SLA Actual elapsed percentage

[billy7]

I read a lot of articles and I don't still understand how actual elapsed percentage is calculated. when I see for example the actual elapsed percentage of the one I attached in this post, I don't get it. I found the script include (SLACalculatorNG) that does the math to try to understand which is the following:

currentSLA.percentage = ((currentSLA.elapsed / (currentSLA.derived_end_time - currentSLA.start_time - currentSLA.pause_duration)) * 100).toFixed('2');

I have no idea where the attribute .derived_end_time is taken from or how it is calculated (there is no field in the task_sla record with that name). Does anybody knows something to guide me here?

Thank you in advance

[ZacharyKenyon]

In that script include, the currentSLA object is not a GlideRecord - it's just a Javascript object populated with values.  It's created in the _createTaskSLA(sla) function in that script include.  The derived_end_time property is calculated based on the sla_duration and business_pause_duration from the task_sla record.  In my instance it's on line 314-315 of that SLACalculatorNG script include:

var dc = this._newDurationCalculator(sla, newTaskSLA.sla_duration + newTaskSLA.business_pause_duration, slaDefGR);

newTaskSLA.derived_end_time = dc.getEndDateTime().getNumericValue();