DSM IV Aspergers was very explicit.
Criterion A (Persistent deficits in social communication and social interaction across multiple contexts) was described "as manifested by the following, currently or by history" along with the injunction to "Specify current severity" and the note "Severity is based on social communication impairments and restricted, repetitive patterns of behavior."
Criterion B (Restricted, repetitive patterns of behavior, interests, or activities) was described "as manifested ... currently or by history). The same severity notes that were given for criterion A applied to criterion B.
Criterion C is very specifically about childhood: "Symptoms must be present in the early developmental period (but may not become fully manifest until social demands exceed limited capacities, or may be masked by learned strategies in later life."
Criterion D is very specifically about the present: "Symptoms cause clinically significant impairment in social, occupational, or other important areas of current functioning."
Criterion E is about differential diagnosis and applicable to both history and current symptoms.