Anomaly Exists Condition on Alerts

Hi, we've created a few alerts with daily time granularity. We've selected the "Anomaly Exists" condition with 90% threshold in all of our alerts, and we've been receiving alert notifications lately. My question is, is there a date range/duration to where this anomaly is being compared to in this case? For example, yesterday or last 30 days? Thanks in advance for the reply!