EventBridgeルールのcronをプレビューしたい

pip3 install --user aws-croniter

import boto3
from aws_croniter import croniter
from datetime import datetime, timezone, timedelta
import re

# JSTタイムゾーン
JST = timezone(timedelta(hours=9))

# EventBridgeクライアント
client = boto3.client('events')

def list_rules():
    rules = []
    paginator = client.get_paginator('list_rules')
    for page in paginator.paginate():
        rules.extend(page['Rules'])
    return rules

def parse_cron_expression(expr):
    # cron(30 0 17 6 ? 2025) -> '30 0 17 6 ? 2025'
    match = re.match(r'cron\(([^)]+)\)', expr)
    if not match:
        return None
    return match.group(1)

def main():
    base_time = datetime.now(timezone.utc)

    rules = list_rules()
    for rule in rules:
        name = rule['Name']
        expr = rule.get('ScheduleExpression')
        if expr and expr.startswith('cron('):
            cron_expr = parse_cron_expression(expr)
            if cron_expr:
                try:
                    itr = croniter(cron_expr, start_time=base_time)
                    next_time = itr.get_next()
                    jst_time = next_time.astimezone(JST)
                    print(f"[{name}] 次回実行日時（JST）: {jst_time.strftime('%Y-%m-%d %H:%M:%S')}")
                except Exception as e:
                    print(f"[{name}] cron式の解釈エラー: {e}")

if __name__ == '__main__':
    main()