JIRA Reports do not respect JIRA's ISO8601 setting

Summary

JIRA Reports do not use the ISO8601 formatting for its date pickers.

Environment

JIRA Core

Steps to Reproduce

1. Setup a JIRA instance with Agile/Software installed;
2. Navigate to Administration > System > Look and Feel and set JIRA to use ISO8601 formatting for date pickers;
3. Navigate to a Project > Reports
4. Click on "Recently Created Issues Report" > Set period to "Weekly"
5. Observe that the reports do not start on Mondays bit on Sunday (ignoring the ISO8601 standard)

Expected Results

JIRA Reports should consistently use the ISO8601 setting if it has been configured in JIRA.

Actual Results

JIRA Reposts does not apply this setting, as a result the weeks start on sunday

Workaround

No known workaround.