I'm built a telegram bot for the groups.When the bot is added to the group, it will delete messages containing ads.How can I change the bot to work for only 30 days in each group and then stop it?
That means, for example, today's bot is added to group 1 and the next week the bot is added to group 2; I need to change the bot to stop the 30 days in group 1 and stop it in group 2 for another 37 days.
How can I do that?
Simply, all you need is a database at the back-end. Just store the group_id and join_date in each row. 
At any time, you can query your database. If more than 30 days has passed join_date, stop the bot or leave the group.
You can also use any other storage rather than a database. A file, index, etc.
How can a telegram bot change that works only for a specific time in a group?