mamweb/mamweb/context_processors.py

from datetime import datetime, date

def vzhled(request):
    ''' Podle casu prida do templatu, zdali je nebo neni noc '''
    hodin = datetime.now().hour
    if (hodin <= 6) or (hodin >= 20):
        noc = True
    else:
        noc = False
    return {'noc' : noc}