timeTracked
timeTracked('startDate','endDate',['userKey'])
You can use this JQL Function in Jira's Advanced search. It would return issues where work had been logged by the given user(s), and work had been logged between the dates.
Syntax:
- startDate, endDate: should be in YYYY-[M]M-[D]D date format
- userKey (optional): user key, or user keys separated by commas