A lot of time passed, exhibited a different version - 7 days, 15 days, 30 days, but the deadline for the expired does not come to the user's notice to the mail in order to update his re-announcement.
Write what to do ?.
Without this function, the board of commissions is not up-to-date.
If I'm not mistaken, then on all the scripts the bulletin board who develops, there is a function for seeing the user about the expiration of his announcement and asking the user to update.

@emma233
Expiration is set on categories and is maintained by osclass, nothing to do with theme.
If you use some plugin for republish, then your cron does not work.

Write to me maybe there is a plugin that is responsible for all this?

@emma233
Information you provided is not complete. If listing in osclass expire, it is not removed anyway.

I meant, is it possible to buy such a plug-in that would solve this issue? If there is an opportunity for you to come to my work, I want to look and study.
I do not know much English. Language and I can write with errors to you. Do not be offended if you read an incomprehensible word. 

@emma
You set expiration on categories, then for new listings this expiration date is applied. Once listing has expired, it is not shown in front anymore.