我如何知道用户何时在 Discord.py 中加入了 Discord(Discord 加入日期，而不是服务器)

I know that to know when a user joined your server, you can: member.joined_at will work out.

解决方案

使用 User.created_at:

@client.command()
async def userinfo(ctx, member: discord.Member):
    created_at = member.created_at.strftime("%b %d, %Y")
    await ctx.send(created_at)