Python logging module emits wrong timezone information

Question

I\'m running into an issue with Python 2.7 logging module. My system is Ubuntu 14.04 64bit, and I live in Italy (currently UTC+1, no daylight saving); the system is properly

Answer 1

logging uses time module that doesn't store timezone in a time tuple and time.strftime() unlike datetime.strftime() doesn't support %z on Python 2. You could override Formatter.formatTime() method to use timezone-aware datetime objects as @dmg suggested instead:

#!/usr/bin/env python
import logging
from datetime import datetime

import tzlocal # $ pip install tzlocal

def posix2local(timestamp, tz=tzlocal.get_localzone()):
    """Seconds since the epoch -> local time as an aware datetime object."""
    return datetime.fromtimestamp(timestamp, tz)

class Formatter(logging.Formatter):
    def converter(self, timestamp):
        return posix2local(timestamp)

    def formatTime(self, record, datefmt=None):
        dt = self.converter(record.created)
        if datefmt:
            s = dt.strftime(datefmt)
        else:
            t = dt.strftime(self.default_time_format)
            s = self.default_msec_format % (t, record.msecs)
        return s

logger = logging.getLogger(__name__)
handler = logging.StreamHandler()
handler.setFormatter(Formatter("%(asctime)s %(message)s", "%Y-%m-%dT%H:%M:%S%z"))
logger.addHandler(handler)
logger.setLevel(logging.DEBUG)

logger.info('something happened')

Output

2015-01-09T18:30:54+0100 something happened