Issue in capturing historical data

i am using the below

current_timestamp = int(datetime.utcnow().timestamp()) 
print(current_timestamp)

start_timestamp = int((datetime.utcnow() - timedelta(days=30)).timestamp())

yesterday_timestamp = int((datetime.utcnow() - timedelta(days=1)).timestamp())

queryParams = f'?start={start_timestamp}&end={yesterday_timestamp}&size=1000'

My intention here is to capture data from: past 30 days from  yesterday

when i try this iam getting empty rows. Any Help?