Quest System

Help im planning to make a daily quest system that loops into a random quest every day and that also has a timer is there any source where i can get a base code?

i don't know if this plan work or not.

In user.cpp check on Buff. if buff is gone and then delete quest id. i doing this for online player buff.

You're better off with storing some information about their "quest" on the database. Either through using and editing the original questing system or creating something new. Probably store when they got the "daily quest" and the daily quest id. But I do suggest looking at the current quest system rather than coding a purely external system unless your plan is to sell the system or replicate the current systems out there.