This is a simple script using the Twilio Python module to retrieve Recordings within a certain date range and then delete them.

delete-recordings.py

from datetime import date
from twilio.rest import Client

account_sid = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
auth_token = "your_auth_token"
client = Client(account_sid, auth_token)

recordings = client.recordings.list(date_created_after=date(2012, 1, 1))

for recording in recordings:
    print("Deleting: " + recording.sid)
    recording.delete()