Yes. You can create as many entries per day as you like.
The easiest way to do so is to tap the “+” icon in the lower right-hand corner of the screen and select “Any Day / Time”. You will then have to select the date for your new entry and after that the time.
Alternatively, you can also open the calendar, and tap any day twice to create an entry. If a day is already colored (meaning an entry has been created for that day), then you just need to tap the plus button in the upper right-hand corner of the daily view.