I am trying to get ArcGIS Server logs using ArcGIS API for Python form this page
https://developers.arcgis.com/python/latest/guide/managing-your-gis-servers/
I am using this code
import datetime
import pandas as pd
now = datetime.datetime.now()
start_time = now - datetime.timedelta(days=10)
recent_logs = server1.logs.query(start_time = start_time)
#print a message as a sample
recent_logs['logMessages'][0]
but I am not getting anything!

but I am able to access to log setting

printing out the `recent_logs` return this

while `start_time` is this

Can you please let me know why this is happening and how I fix this?