如何知道用户何时在Discord.py中加入不一致(不一致加入日期，而不是服务器)

import discord
from discord.ext import commands

bot = commands.Bot(command_prefix='!')

@bot.event
async def on_ready():
    print(f'Bot is ready. Connected to {len(bot.guilds)} guilds.')

@bot.command()
async def check_join_date(ctx, user: discord.User):
    member = ctx.guild.get_member(user.id)
    if member:
        actual_join_date = member.joined_at
        await ctx.send(f'{user.name} joined the server on {actual_join_date}')
    else:
        await ctx.send('User not found in this server.')

from datetime import datetime

@bot.command()
async def verify_join_date(ctx, user: discord.User, claimed_date: str):
    member = ctx.guild.get_member(user.id)
    if member:
        actual_join_date = member.joined_at
        try:
            claimed_date = datetime.strptime(claimed_date, '%Y-%m-%d')
            if actual_join_date.date() == claimed_date.date():
                await ctx.send(f'Join dates match! {user.name} joined on {actual_join_date}')
            else:
                await ctx.send(f'Join dates do not match. Actual join date: {actual_join_date}, Claimed join date: {claimed_date}')
        except ValueError:
            await ctx.send('Invalid date format. Please use YYYY-MM-DD.')
    else:
        await ctx.send('User not found in this server.')