Zabbix Configuration Assistance - Dependent Item Creation

I need help with Zabbix 4.2.5 template setup. The specific tasks I need assistance with: - Creating a dependent item to calculate the age of a Unixdate in hours. - Setting up a trigger to fire if the age exceeds a certain threshold (24 hours). - Variation on the above trigger conditions based on the day of the week. This includes: - firing if the item is older than 24 hours from Tuesday to Saturday, - older than 48 hours if it's Sunday, - older than 72 hours if it's also Sunday. You will not have access to my Zabbix for live work. I will share screenshots of my current configuration, and I would need you to provide me with screenshots and text to copy/paste. Please be someone experienced configuring Zabbix, then this will be an easy one.