diff --git a/telegram_bot/api_handling/api_handler.py b/telegram_bot/api_handling/api_handler.py
index c06e6ee..c5bc997 100644
--- a/telegram_bot/api_handling/api_handler.py
+++ b/telegram_bot/api_handling/api_handler.py
@@ -12,6 +12,7 @@ __license__ = "None"
 import sys
 import os
 import requests as r
+from croniter import croniter
 
 
 
@@ -32,7 +33,6 @@ class API_Handler:
         delete_share(user_id, symbol): deletes the share of the user
         get_user_transactions(user_id): gets the transactions of the user
         set_transaction(user_id, transaction): sets the transaction of the user
-        delete_transaction(user_id, transaction): deletes the transaction of the user
         get_user_portfolio(user_id): gets the portfolio of the user
         set_portfolio(user_id, portfolio): sets the portfolio of the user
         delete_portfolio(user_id, portfolio): deletes the portfolio of the user
@@ -322,6 +322,10 @@ class API_Handler:
         Returns:
             int: status code
         """
+        if not croniter.is_valid(cron_interval):
+            print("Error: Invalid cron format")
+            return -1
+
         with r.Session() as s:
             headers = {'Authorization': 'Bearer ' + self.token + ":" + str(user_id)}
             req = s.put(self.db_adress + "/user/setCron", json={"cron": cron_interval}, headers=headers)
diff --git a/telegram_bot/bot.py b/telegram_bot/bot.py
index b1d985b..e2cb748 100644
--- a/telegram_bot/bot.py
+++ b/telegram_bot/bot.py
@@ -437,7 +437,56 @@ def set_new_transaction_step(message):
         bot.send_message(chat_id=user_id, text=f'Failed adding transaction. (statuscode {status})')
 
     
+@bot.message_handler(commands=['interval'])
+def send_interval(message):
+    """ send interval for user
+    :type message: message object bot
+    :param message: message that was reacted to, in this case always '/interval'
 
+    :raises: none
+
+    :rtype: none
+    """
+    user_id = int(message.from_user.id)
+    interval = api_handler.get_user(user_id)['cron']
+    if interval == None:
+        bot.send_message(chat_id=user_id, text='This didn\'t work. Make sure too connect your telegram id (/id) on https://gruppe1.testsites.info and set an interval with /setinterval')
+        return
+    else:
+        interval = str(interval)
+        formatted_interval = str(interval).replace(' ', '_')
+        bot.send_message(chat_id=user_id, text=f'Your update interval: {interval} (https://crontab.guru/#{formatted_interval})', parse_mode="MARKDOWN")
+    
+
+@bot.message_handler(commands=['setinterval'])
+def set_new_interval(message):
+    """ Set new interval for user
+    :type message: message object bot
+    :param message: message that was reacted to, in this case always '/setinterval'
+
+    :raises: none
+
+    :rtype: none
+    """
+    user_id = int(message.from_user.id)
+    bot.send_message(chat_id=user_id, text='Type interval in cron format (https://crontab.guru/):')
+    bot.register_next_step_handler(message, set_new_interval_step)
+
+def set_new_interval_step(message):
+
+    user_id = int(message.from_user.id)
+    interval = str(message.text)
+    status = api_handler.set_cron_interval(user_id, interval)
+
+    if status == 200:
+        bot.send_message(chat_id=user_id, text='Interval succesfully set.')
+        return
+    
+    if status == -1:
+        bot.send_message(chat_id=user_id, text='Invalid interval. Try again with /setinterval.')
+        return
+    else:
+        bot.send_message(chat_id=user_id, text=f'Failed setting interval. (statuscode {status})')
 
 
 @bot.message_handler(func=lambda message: True) # Returning that command is unknown for any other statement
diff --git a/telegram_bot/requirements.txt b/telegram_bot/requirements.txt
index 2e8462d..146877f 100644
--- a/telegram_bot/requirements.txt
+++ b/telegram_bot/requirements.txt
@@ -5,3 +5,4 @@ newsapi-python~=0.2.6
 python-dotenv~=0.20.0
 requests~=2.27.1
 APScheduler~=3.9.1
+cronitor~=1.3.4