Changing the start of the day to 8am

Currently I’ve been using the “Share availability” shortcut A TON. One nagging part of it is the text outputs “Start of day” instead of a specific time. I typically start taking meetings at 8:00am so is there a way to have it check my availability on the days I select starting at 8:00am and state as suck?

https://www.icloud.com/shortcuts/8db20d3ad8fc45619dbc9a14597c9101