Round up UTC now timestamp

utc_now_round_up_without_tz.py

import pandas as pd

utc_now_pd = pd.Timestamp.utcnow()
# The function round(freq="D") is magic behind the round up
# Use replace(tzinfo=None) to remove timezone information
utc_now_ceil = utc_now_pd.round(freq="D").to_pydatetime().replace(tzinfo=None)
# Convert to ISO format
utc_now_str = utc_now_ceil.strftime("%Y-%m-%dT%H:%M:%S")

If you want to subtract some days just do:

from datetime import timedelta

utc_now_ceil - timedelta(days=7)