round_datetime_down# round_datetime_down(ts, delta, offset=datetime.timedelta(0))[source]# Snap to previous available timedelta. Preserve any timezone info on ts. If we are at the the given exact delta, then do not round, only add offset. Parameters: ts (datetime) – Timestamp we want to round delta (timedelta) – Our snap grid offset (timedelta) – Add a fixed time offset at the top of rounding Returns: When to wake up from the sleep next time Return type: datetime