How do I fix my datetime command in my Discord Bot?

Question

I've recently began to learn about Discord Bots and tried to make one myself, I've got some basics working but haven't been able to get a new section of the code working which is supposed to get the current datetime and was wondering what I've done wrong.

Edit: This is currently hosted on Heroku so I have no idea how to check for errors

import discord
from datetime import datetime

intents = discord.Intents.default()
intents.members = True

client = discord.Client(intents=intents)

@client.event
async def on_member_join(member):
    print(f'{member.name} has joined the server')
    channel = client.guilds[0].get_channel(745404752161931266)
    print(channel)
    await channel.send(f'{member.name} has joined the server')

@client.event
async def on_member_remove(member):
    print(f'{member.name} has left the server')
    channel = client.guilds[0].get_channel(745404752161931266)
    print(channel)
    await channel.send(f'{member.name} has left the server')

@client.event
async def on_message(message):
    channel = client.guilds[0].get_channel(765757497155649567)
    if message.content.find("!hello") != -1:
        await message.channel.send("Hello!")

@client.event
async def on_message(message):
    now = datetime.now()
    dt_string = now.strftime("%d/%m/%Y %H:%M:%S")
    if message.content.find("!datetime") != -1:
        await message.channel.send("date and time =", dt_string)
        
client.run('[my_token]')

Answer 1

You can't have more than one the same listener, you have to put your whole code in one

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

    if message.content.startswith('!hello'):
        # ...
    elif message.content.startswith('!datetime'):
        # ...

A better alternative to that is using commands.Bot , here's an example:

import discord
from discord.ext import commands

intents = discord.Intents.default()
intents.members = True

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


@bot.event
async def on_ready():
    print(f"Logged in as {bot.user}")


@bot.command()
async def hello(ctx):
    await ctx.send('Hello!')

# To invoke: `!hello`

bot.run('token')

This class is a subclass of discord.Client and as a result anything that you can do with a discord.Client you can do with this bot.

But if you really wanna stick with discord.Client you can create custom events with client.dispatch('name of the event', *args) sadly there's no docs about it.

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

    if message.content.startswith('!hello'):
        # Dispatching the custom event
        client.dispatch('hello', message)


@client.event
async def on_hello(message):
    """Notice how the event it's called `on_hello` not `hello` and
    takes the same arguments that we specified in `client.dispatch`"""
    await message.channel.send('Hello!')

Also to check the logs from your heroku app:

heroku logs -a {name of the app} 
or
heroku logs -a {name of the app} --tail