В примере - вывод времени с фильтром
# coding:utf8
from datetime import datetime
from bottle import jinja2_template as tpl
def onlytime(v,mode=0):
return v.strftime('%H-%M-%S') if mode else v.strftime('%H:%M:%S')
print tpl("{{ dt|onlytime }}, {{ dt|onlytime(1) }}\n",dt=datetime.now(),
template_settings={ 'filters':{ 'onlytime':onlytime } } )
02:21:18, 02-21-18