There are a number of ways to restrict the values that appear in a value list. A calculation dialog inside Manage | Value Lists, however, is not an option.
The most commonly used method is to set up a relationship to limit the values. If, for example, you defined an unstored calculation field with a date result type as: Get ( CurrentDate ) - 60, you could define a relationship with an inequality operator instead of the default = to match to only records that are 60 days old or newer. That relationship could then become the basis for your conditional value list.
I recommend that you download the free file: "Adventures in FileMaking #1 - Conditional Value Lists". This file demonstrates 10 different ways to produce a conditional value list. Using a relationship is the first such example demonstrated. This is an unlocked database file with detailed explanations and documentation on each method demonstrated so that you can read the explanatory text and then drop into design mode in order to examine the actual implementation of what was demonstrated.