Actually, nevermind. I just got it solved by my own.
But since it's here already, I'll share how to get days only to print in the string. You can also use some parts of it for logic script building.
import c4d
import datetime
#Welcome to the world of Python
def main():
global Output1
starttrial = datetime.date.today() # Date on your computer
endtrial = datetime.date(2019,9,1) # Date on when it expires
TimeComparison = endtrial - starttrial # Date comparison
Output1 = "You only have " + (str(TimeComparison.days)) + " days before this rig expires..." #Print as String