The same is true for any field that allows to be searched in a specific range such as the size, sent, received and modified fields. To search in a specific date range, you could use both after: and before: commands but there is a more direct way to do this as well.
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See the Ranges section on how to search between other size ranges.
To find all files that are exactly 5MB in size (5120KB) Behind this command follows a date statement that matches with the date format you have configured in Windows. This usually corresponds with either when the message or other Outlook item was received, sent, created or modified. To find items based on their primary date field, you can use the before: and after: command.
While many of the commands and fields can also be found and selected directly within Outlook, not all of them are exposed. With this integration, you also have access to a lot of special search commands and index fields to refine your search. As this is an indexed search, it allows for faster search query results than with the traditional built-in Search function in Outlook. Outlook’s Search function integrates with the Windows Search Indexer of Windows.