What is the meaning of 的 in "有一天你会明白的"? From Why is 的 used in 你是哪一天出生的 and 我们什么时候开始的 and 前天你什么时候来的这里?, I understand 的 at the end of a sentence describes an event that happened in the past.
However, I am not sure whether I understand the meaning of 的 at the end of this sentence correctly:

有一天你会明白的。

This sentence emphasizes an event that might happen in the future. So 的 here is not describing an event that happened in the past. Correct?
Why does it have 的 at the end? Is it because 它 = it has been omitted? Such as:

有一天你会明白的它 = one day you will understand it.
In Taiwan, According to dictionary owned by Ministry of Education.
的 can mean:

句尾助詞：置於句尾，表示肯定或加強的語氣。

(助詞 at end of the sentence denoting affirmation, or intensify tone.)
有一天你會明白的它 is not correct. You put 它 at wrong position. 有一天你會明白它的 can be better.