Issue in capturing historical data

if i use this i am getting data

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

start_timestamp = int((datetime.utcnow() - timedelta(days=30)).timestamp())
queryParams =  f'?start={start_timestamp}&end={current_timestamp}'
print(start_timestamp)

From today to last 30 days we are getting data

epoch = str(int(time.time() * 1000))  ( both the cases we are using this)