[FR] Layout calendar by Create Date and/or Last Modified Date

### Description

Layout calendar by Created Date or Last Modified date.
Currently, we can only layout calendar with a date field, would be nice if we could do the same for the two other suggested fields, which are also datetimes.

### Impact

Allows us to use the databases as a simple diary or log - eg.: Finance tracking based on when the expense was created, or updated.

### Additional Context

_No response_

No files, tests, or entry points are named; begin by locating the existing calendar layout and the database view handling for Created Date and Last Modified Date. Confirm the supported date fields, then verify that calendars can use either field while preserving existing date-field behavior.

Written by the indexing model from the issue text.