Simulate cron with screen manager
 

I can't use cron on server. But on the same server i can use screen.
Is there any way (any program) to run something like cron in the screen session? Or any solution for that problem.

first of all what is it you are attempting to do periodically? how often? and why CAN'T you use cron?

I'm not permited i'm only user of this server.

Once a day now. But maybe there will be need to do it often.
I know, that i can write a script in bash.
But i was wondering that meybe there is way to run something like cron daemon in screen.

if you have ssh access perhaps you could set up some passwordless authentication such as a private key and simply have a workstation on which you are able to configure cron run a script that logs into the server and remotely executes the task? just a thought, otherwise there is the at command but i think that only executes the command ONCE at a specified time