Cronos VS QuartzNet

HangfireIO/Cronos: Fully-featured .NET library for working with Cron expressions. Built with time zones in mind and intuitively handles daylight saving time transitions (github.com)

We do this sort of thing with an IHostedService in our application that uses a cron expression (using https://github.com/HangfireIO/Cronos) to control when to process the task

You could use this: https://github.com/HangfireIO/Cronos

I would agree with using Job over Queue. Therefore I would recommend looking at Quartz.Net https://www.quartz-scheduler.net/

You can use something like https://www.quartz-scheduler.net/ to create multiple recurring jobs based on the definition you load from a DB.

Or use an existing open source scheduling solution like https://www.quartz-scheduler.net/

If you're interested in using Quartz, you can check out their GitHub repo here: https://github.com/quartznet/quartznet. They also have extensive documentation available on their website: https://www.quartz-scheduler.net/documentation/index.html.

You should use an actual scheduler. https://www.quartz-scheduler.net/

Better to use a framework like Quartz.NET for scheduling background tasks. How it works inside the box I have no idea, but I have used it extensively in my web applications, and those background tasks run 24/7, come hell or high water. It's a good library, and it's easy to use.