Check out example codes for "sqlalchemy postgres timestamp with timezone". It will help you in understanding the concepts better.

Code Example 1

from sqlalchemy import Column, DateTime, Integer, MetaData, Table
from sqlalchemy.sql import func

metadata = MetaData()

example = Table('example', metadata,
    Column('id', Integer, primary_key=True),
    Column('date', DateTime(timezone=True), default=func.now())
    )

Learn ReactJs, React Native from akashmittal.com