Jira Service Desk not saving Holiday on the select date.

Issue Summary

When you set a new holiday on JSD and save the date Jira automatically modifies to a day before: E.g Set the holiday to Oct 20th, after saved, the date changes automatically to Oct 19th.

Environment

• Jira Software/Core - 8.4.0
• Jira Service Desk - 4.4.1
• Database: Postgres

Steps to Reproduce

1. Set the server to the NY time zone(america/New_York).
2. Start Jira
3. Set the profile of the admin for the Toronto Time zone. 
4. Add a new holiday under the calendar on Project Settings.
5. Click on save

Expected Results

That Jira will be able to save the selected date.

Actual Results

Jira saves the new holiday for a day before (E.g pick the day 25 of December, When you click on save Jira will save it to 24th of December)

Notes

I was able to replicate with the server on the following time zones (GMT -5, GMT -4, GMT -3). And the user profile on (GMT -5, GMT -4, GMT -3).

Workaround

We will have to follow the steps below in order to proceed with the workaround:

• Go to the darkfeature page: <Jira_URL>/secure/SiteDarkFeatures!default.jspa
• Add the following feature:

  sd.workinghours.new.page.disabled
  

• Try to add a new holiday again.