Here is cloneable app that say greeting based on time
in my example, GMT+7, so the fraction need to be substracted with 7*60/1440
to calculate variable related to user, it is better doing it in the collection, then using update operation, we can have option of magic text and custom formula
change input value and sometimes visible are still very limited, so we need proxy variable, which is in users’ collection property.
I didn’t realize that checking time in app dev need intense calculation like this, probably, I used to look at the time at granted.