Get remain estimate in a specific date


I need to do a productivity calculation and this involves the issue time spent and issue remain estimate in a reference date (this date is a custom field).

I am using Misc Custom Fields to create a calculated number field in issue.
I got a help here to get formula and sum of worklogs to date. And it worked.

<!-- @@Formula:
import com.atlassian.jira.component.ComponentAccessor;

if (issue.get("timespent") == null) return;
customDate = issue.get("customfield_10300");
if (customDate == null) return;

hours = 0.0;
worklogManager = ComponentAccessor.getWorklogManager();
for (worklog : worklogManager.getByIssue(issueObject)) {
if (worklog.getStartDate().getTime() <= customDate.getTime()) {
hours += worklog.getTimeSpent() / 3600.0;

if (hours > 0) {
return hours;

Now I'm having difficulty writing the calculation that gets the remaining estimate in this date.

I got a tip from EazyBI team to get the last remaining estimate before this date from issue changelog, but i don't know how to do this.

Could anyone help me?


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