Is there an archive of IBMQ calibration data?

Question

Specifically, I'd like to see the ibmq_london calibration file for April 15, 2020.

Answer 1

Historical calibration data are available for each device via the backend.properties() method. It accepts a datetime field.

from datetime import datetime

t = datetime(day=15, month=4, year=2020, hour=10)
london_backend.properties(datetime=t)