Obtenir l'heure actuelle JST en notation ISO8601

#Exemple de notation de base ISO 8601) "20140526T123456+0900"
jstnow().strftime('%Y%m%dT%H%M%d%z')
#Exemple de notation étendue ISO 8601) "2014-05-26T12:34:56+0900"
jstnow().strftime('%Y-%m-%dT%H:%M:%d%z')
#Exemple de notation étendue ISO 8601) "2014-05-26T12:34:56.123000+0900"
jstnow().isoformat()

from datetime import *

def jstnow():
  # JST timezone(+0900)
  class JST(tzinfo):
    def utcoffset(self, dt):
      return timedelta(hours=9)
    def dst(self, dt):
      return timedelta(0)
  return datetime.now(JST())

Implémentation pour calculer explicitement la différence avec UTC

from datetime import *

def jstnow():
  # UTC tzinfo
  class UTC(tzinfo):
    def utcoffset(self, dt):
      return timedelta(hours=0)
    def dst(self, dt):
      return timedelta(0)
  # JST timezone(+0900)
  class JST(tzinfo):
    def utcoffset(self, dt):
      return timedelta(hours=9)
    def dst(self, dt):
      return timedelta(0)
  return datetime.utcnow().replace(tzinfo=UTC()).astimezone(JST())