Wrong 'due date' when update it in a Workflow Task

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, Master
• Fix Version/s: 7.0.0 DXP FP44, 7.0.6 CE GA7, 7.0.0 DXP SP8, 7.0.X, 7.1.0 M2, 7.1.X, Master
• Component/s: Workflow, Workflow > My Workflow Tasks
• Labels:
  • ee-ts
  • fw_test_needed
  • liferay-digital-enterprise-70-sp8
  • liferay-fixpack-de-44-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/56605

After update the due date in a Workflow Task, the value of this date is wrong because is not keeping in mind user's timezone.

Steps to reproduce master/7.0.x:

1. Start portal (tomcat setenv script by default use option -Duser.timezone=GMT for JVM).
2. Create a new user.
3. Go to Users > Users and Organizations > Select user created in step 2.
4. Inside the user created, go to tab Preferences > Display Settings > Time Zone > Select '(UTC +01:00) Central European Time'
5. Go to Site Menu > Content > Dynamic Data Lists and create a DDL with some Data Definition (e.g. Contact) and Workflow ' Single Approver (Version 1) '
6. Go to DDL created in step 5 and create new register.
7. Go to User Menu > My Workflow Tasks > Assigned to My Roles
8. Click to 'Update Due Date' by Kebab Menu, you will see time in UTC+1, click "Done".
9. Check 'Due Date' column.

Expected behavior:
Due Date should be now.
Current behavior:
Due Date will be in an hour.