I think the more straightforward you are, the better the other person will understand what the time is. For example, nine-thirty or nine thirty-five. Even though, as the first comment above, it is used interchangeably.
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June 14, 2018
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Something important that you need to take into account is that when using a tense in a sentence, you should sitck to it. The example that you're providing is good since the tense of the sentence is present and its aspect it is PERFECT. Even though, a person could say the second sentence and will be understandable.
