Search REST API uses the instance's timezone instead of the user's one

Issue Summary

When using the /wiki/rest/api/content/search endpoint to search for pages based on modified/ created dates, the API is currently using the instance's timezone instead of the one defined on the user's profile.

Steps to Reproduce

1. Create a page and remember the exact time of creation
2. Use the /wiki/rest/api/content/search endpoint to look for pages created/ modified at that time
   e.g. /wiki/rest/api/content/search?cql=(lastmodified > "2020-10-19 19:00")
3. Change your profile's timezone
4. Search again, changing the time to reflect the specific timezone chosen

Expected Results

The results should be based on the user's timezone (set individually on the user settings/ profile)

Actual Results

The search will be based on the instance's timezone (timezone for the user who created the instance).

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available.