Modify payload

import json
from datetime import datetime

api = platform.api
payload = event.request.payload
headers = event.request.headers
resource = event.resource

epoch = datetime(1970, 1, 1)


def timestamp_to_datetime(ts):
    return datetime.utcfromtimestamp(int(ts)).strftime('%Y-%m-%d %H:%M:%S')


def datetime_to_timestamp(dt):
    return (dt - epoch).total_seconds()


required_time_fields = ['start', 'start_datetime', 'end', 'end_datetime']
for rec in payload.resource:
    if all([field in rec for field in required_time_fields]):
        continue
    if 'start' in rec and 'start_datetime' not in rec:
        rec.start_datetime = timestamp_to_datetime(rec.start)
    if 'end' in rec and 'end_datetime' not in rec:
        rec.end_datetime = timestamp_to_datetime(rec.end)
    if 'start_datetime' in rec and 'start' not in rec:
        rec.start = datetime_to_timestamp(rec.start_datetime)
    if 'end_datetime' in rec and 'end' not in rec:
        rec.end = datetime_to_timestamp(rec.end_datetime)

event.request.content = json.dumps(event.request.payload)