[Security Solution] Incorrect timestamp shown for the "description" comment in Timeline's Notes tab

[andrew-goldstein]

Describe the bug:

When a saved timeline is re-opened, an incorrect timestamp is shown for the "description" comment in Timeline's Notes tab.

Kibana/Elasticsearch Stack version:

7.15

Steps to reproduce:

1. Navigate to the Security Solution

2. Click Untitled timeline to open Timeline

3. Enter the following query: host.name: *

4. Give the Timeline a Title (name) to save it

5. Click the Add notes for this event button on any row, and enter the following note:

This note was added before the timeline had a description

6. Add a description to the Timeline

7. Once again, click the Add notes for this event button on a different row, and enter the following note:

This note was added after the timeline had a description

6. Visit the Notes tab

Expected result

• The note containing the description appears as the top comment
• All notes are displayed with the expected relative times, as shown in the following screenshot:

7. Click the + icon and choose Create new timeline to clear the current timeline

Expected result

A new, untitled timeline is created

8. Click the + icon, and then click Open Timeline...

9. Open the timeline you previously created

10. Click the Notes tab

Expected results

• The note containing the description appears as the top comment
• All notes are displayed with the expected relative times

Actual results

• The note containing the description appears as the top comment
• An incorrect timestamp is shown for the "description" comment in Timeline's Notes tab, per the following screenshot:

Above: The top "description" comment shows 18 seconds ago instead of the correct relative time

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)