如何在我的discord服务器中获取消息作者的时区？(discord.py)

import discord
import pytz

client = discord.Client()

@client.event
async def on_ready():
    print('Bot已登录')

client.run('YOUR_BOT_TOKEN')

@client.event
async def on_message(message):
    author = message.author
    timezone = pytz.timezone('时区名称')  # 替换为作者所在的时区名称
    current_time = datetime.now(timezone)
    print(f'{author.name}的时区是{timezone}，当前时间是{current_time}')

@client.event
async def on_message(message):
    if message.author == client.user:
        return

    if message.content.startswith('!时区'):
        await message.author.send('请回复您所在的时区名称')
    
    if isinstance(message.channel, discord.DMChannel):
        author = message.author
        timezone = pytz.timezone(message.content)
        current_time = datetime.now(timezone)
        print(f'{author.name}的时区是{timezone}，当前时间是{current_time}')