Printed in Xanathar's Guide to Everything on page 138, the magic item Orb of Time has the following description:
Wondrous item, common
While holding this orb, you can use an action to determine whether it is morning, afternoon, evening, or nighttime outside. This property functions only on the Material Plane.
During a PvP one-shot, I pulled this object out of my pocket, as the one Common-quality Magic item each player was entitled to, and declared "I use my action to make it midnight!", expecting that the sudden loss of sunlight would confer advantage to one of my Shadow Blade-wielding rivals (whom I expected would be easier for me to fight than the opponent she was up against).
My DM then informed me that that wasn't how the item was meant to work, and we had a laugh about how my character believed that that's how the item worked and so just assumed from the [lack of] outcome that she was not on the Material Plane.
She's 800+ years old with an Intelligence of 8, it's entirely in character that that's what she would think it would do.
But, it begs the question: which of us were actually right? Is the Orb of Time capable of literally changing the time of day, or is it a glorified pocketwatch?