Simply have it on your person or equipped as an accessory to have the time appear in the top right-hand corner of your screen.
It simply has to be in your inventory somewhere in order for the time to be displayed, you do not have to have it equipped. However, if it is equipped in a vanity slot, you will not see the time displayed. This can be used to hold the watch until you need to check the time, so that it does not take up a slot in your inventory.
Telling the time can be important for when you are tackling a difficult boss encounter. Some bosses like the Empress of Light will kill you in one hit if the time happens to be 7:29 and you kill a prismatic lacewing. Keep an eye on your timer and ensure you are getting into the fight you want, so you do not waste the time you spent on finding that lacewing. Speaking of the prismatic lacewing, this elusive critter only spawns between 7:30 and 12:00 at night. Keeping an eye on the time can keep you from wasting your time wandering through the hallow at night.
Starting a boss fight as early as you can, right when it turns to nighttime, can give you the time you need to finish off a boss before they flee at dawn. If your DPS is low, starting the boss fight at the right time can be crucial to ensure that you can defeat them before they run away or simply execute you.
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