DateTime field - Time in less than 5 min increments?

[MKF62]

I noticed that when I configure a popup for a date/time field, it won't give me times in less than 5 minutes increments. It seems there is no way to change this. What could I do instead that would allow me to enforce data integrity? This is time being recorded is unrelated to the creation or modification of the data, so editor tracking is not the answer. I will be using this in Collector Classic

[MKF62]

So it appears that the calendar and date picker in collector will actually do 1 minute increments. I don't see a way to do it on AGOL but that doesn't matter to me.