Hi.
You posted in our Pre-Sales forum from a user account that doesn’t have any purchases associated with it.
We don’t answer support questions for Events core/free or PRO add-on in the Pre-Sales forum.
If you made your purchase(s) through a different user account, please login to that account and then post in one of the paid forums.
Thank you for your understanding and thank you for using our plugins.
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That being said…
I previously answered this question at https://wordpress.org/support/topic/set-startend-time-interval-to-single-minutes
Which links to this code snippet:
Here: https://gist.github.com/cliffordp/0e69539fc092d0c9e678
I hope that helps. 🙂