from datetime import datetime
import pytz

JST = pytz.timezone("Asia/Tokyo")
CST = pytz.timezone("America/Chicago")

def to_jst_timestamp(s: str, format_str="%Y-%m-%d %H:%M:%S"):
    if type(s) is not str: return None
    naive_dt = datetime.strptime(s, format_str)
    jst_dt = JST.localize(naive_dt)
    cst_dt = jst_dt.astimezone(CST)
    return cst_dt