Hi Landen Lefrancois
UTC functions use the UTC calendar., and datetime functions
uses the user calendar.
I think this is not an issue you need to distinguish between UTC and user calendar
try to use parseDateTime function inside the daysBetwwen function
also you can see this to understand more about date time functions
Please recommend this as accepted answer if it answers your question
Thank you
You've not said where you are in the world, but it sounds like you are in a country that changes it's clocks for daylight saving. The dates you have given cross the DST boundary, so the UTC time between the two dates won't round up to a complete day.
If the dates in your Mendix application are localised then use trimToDays instead of trimToDaysUTC in your calculation.
Good luck!