What is the meaning of "later on the day"

The sentence is

Please note that only candidates who actually pass the tests will receive a notification by email later on the day.

I would like to ask that "later on the day" is when? Is that specified like the next day?


Solution 1:

"Later on the day" is non-idiomatic in my opinion. I would assume they meant later the same day, but I would phrase it either "later in the day" or "later on in the day".