You can use the CHANGED operator but it is not available on all fields. Check https://confluence.atlassian.com/jirasoftwarecloud/advanced-searching-operators-reference-764478341.html#Advancedsearching-operatorsreference-CHANGEDCHANGED for more details.
there's no query that gives you the date and time when a field changed. As Jobin answered, you can query for issues where the field changed after a specified date or between two dates.
If you want to query the date and time exactly, you need to write the changing date into a custom field with a workflow post function.
The result of any JQL is set of issues and there is not way to make JQL to return any other info. Instead you can search issues for which specific field was changed during some period:
priority changed AFTER startOfMonth() // or priority changed DURING ("2017/03/01","2017/03/10")
See here for more start* and end* period functions:
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