in my python lambda code that scans dynamodb based on primary key as 'deviceId' & sortkey timestamp( which is in YYYY-MM-DD HH:MN:SS format) , i need to scan every for last 15min data (from time now). I am in Mumbai region (ap-south-1), how do I set local timezone in my following lambda code. since it is picking default utc datetime.The lambda ideally has to scan & if return count >= 10 then thermostat+5 .

import boto3
import math
import json
import time
from datetime import datetime,timedelta
from dateutil.tz import tzlocal
from boto3.dynamodb.conditions import Key, Attr

client = boto3.client('dynamodb')
dynamodb = boto3.resource('dynamodb')

def lambda_handler(event, context):

    #table_name= "thermostat_dynamo"
    table_name= "newsensor"
    Primary_Column_Name = 'deviceId'
    table = dynamodb.Table(table_name)
    #key_param = "thermostat"
    #thermostatVal = table.get_item(Key={key_param:event[key_param]}) ## get record from dynamodb for this sensor
    thermostatVal= 77
    #now = datetime.now()
    now = datetime.now(tzlocal())
    fifteen_min_ago =  now - timedelta(seconds=900)
    now = now.strftime('%F %T')
    fifteen_min_ago = fifteen_min_ago.strftime('%F %T')

    fe = Key('timeStamp').between(fifteen_min_ago,now);
    response = table.scan(FilterExpression=fe & Attr('temperature').lt(thermostatVal))

    if response['Count'] == 10:
    #return thermostatVal+5 
        thermonew = thermostatVal + 5
        tosensor = '{"thermostat":'+'"%s"}' %thermonew
        print(tosensor)
        #response = client.publish(topic="updatehomesensor", qos=1, payload=tosensor)
        return

    elif response['Count'] < 10:
        #tosensor = '{"thermostat":'+'"%s"}' %thermostatVal
        print('{"thermostat":'+'"%s"}' %thermostatVal)
        #response = client.publish(topic="updatehomesensor", qos=1, payload=tosensor)
        return