from datetime import datetime

def now():
    """Returns a string for the current day and time

the format YYYY-MM-DD HH:MM:SS is like the internet format"""
    now = datetime.now()
    return now.strftime("%Y-%m-%d %H:%M:%S")  # like the internet standard

# the following code is only executed if this file is invoked from the
# command line as a script, rather than loaded as a module.

if __name__ == '__main__':
    print(now())