Official comment
ONTRAPORT now includes several past and future dates to test against in Conditions, Campaigns, Groups, Rules, etc.:

You can create Rules in ONTRAPORT that update or are triggered by numerical values of your numeric contact Fields. Furthermore, by plugging mathematical algorithms and Merge Fields into the Field Values of your Rules, you’re able to create Rules that do the following:
Update the numerical value of a contact Field (Rule action)
Perform an action triggered by the numeric value of a contact Field in relation to any number (Rule trigger and condition)
Perform an action triggered by the numeric value of a contact Field in relation to the numeric value of another field (Rule trigger and condition)
Use the numerical value of a contact Field in relation to any number as a Rule condition
Use the numerical value of a contact Field and it’s relation to the numerical value of one or more numeric contact Fields as a Rule condition
Create a custom numeric Field in the ONTRAPORT Field Editor
Create a Rule incorporating that numeric Field into your Rule’s Trigger and Condition or your Rule’s Outcome (or both).
Add a Trigger, Rule, or Condition that includes the field value of one of your numeric Fields
Insert the Merge Field for the numeric Field you’re using in your Rule into the Field value
Insert an algorithm of your choice (see below for valid equations)
Test your Rule
[YOUR FIELD]+1
[YOUR FIELD]*4
8/[YOUR FIELD]
[FIELD A]*[FIELD B]
[FIELD A]*[FIELD B]/([FIELD C]+5)


ONTRAPORT now includes several past and future dates to test against in Conditions, Campaigns, Groups, Rules, etc.:

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No plans on Date values? See example below:
Rule: If field: [Latest Activity] is greater than or equal to date [set to current date] and + 6 months then add contact to tag: Active List
Where:
[Bracketed] text here is a merge field
Underlined text here is a selection from a drop down menu
Bolded text is an entry on a text field.
Any update on Date Values as per Kim ?
We don't have math operations on anything other numeric fields at the current time, and I don't have an ETA on adding them. There is an active feature request to add "date math" operations here:
http://support.ontraport.com/entries/57376010-Date-math-and-text-combining-concatenation
Voting for these does help us prioritize new features!