I'm building an NSPredicateEditor, and I want the ability to do advanced date comparison.

I realize that I can build an NSPredicateEditorRowTemplate with a rightExpressionType of NSDateAttributeType, but the predicates I want to build need to be much more advanced than that.

For example, I need to basic comparison like:

• dateKeypath < aDate
• dateKeypath <= aDate
• dateKeypath = aDate
• dateKeypath != aDate
• dateKeypath > aDate
• dateKeypath >= aDate

These basic comparisons are quite easy to achieve, and I have these working. However, I also need to do comparisons like:

• dateKeypath isInTheLast n days (or weeks, months, years)
• dateKeypath isNotInTheLast n days (or weeks, months, years)
• dateKeypath between aDate and anotherDate

How can I achieve these sorts of comparisons? I understand that I'll need to create a custom NSPredicateEditorRowTemplate, but I haven't found any clear documentation on how to achieve something like this.

EDIT Bonus points are available for also knowing how to make these comparisons a full date-time (year-month-day-hour-minute-second) comparison (as NSDateAttributeType only has year-month-day granularity).