If you are using Cortana on Windows 10 PCs or phones you can set a reminder using natural language. Simply by saying “Hey Cortana, remind me to pick up milk at 5 pm,” Cortana will log the information in her notebook, and then give you an alert on your PC or your phone based on the conditions you set. You can add conditions based on location, time, and even when someone calls you.
Sadly, Cortana on Xbox One doesn’t support reminders yet, but that’s set to change.
In an exchange with Zach Johnson who leads Cortana’s development on Xbox One, he noted that reminders are on the backlog for the console version, and work has begun to bring them across.
https://twitter.com/Zjohnson/status/762099007770337280
There isn’t a planned release date for, but it will be great to have Cortana reach parity across the entire Windows 10 device family.