Python logging is outputting with the time 4 hours ahead of system

Question

My system is set to EDT in Linux, and I can confirm this in Python with datetime.now(). However the logger is outputting 4 hours ahead. What could be the cause of this?

EDIT: Logging config looks like this:

logging.basicConfig(level=logging.DEBUG)
lf = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")

mylogger = logging.getLogger('mylogger')
mylogger .setLevel(logging.DEBUG)

lsh = logging.StreamHandler()
lsh.setLevel(logging.DEBUG)
lsh.setFormatter(lf)
mylogger.addHandler(lsh)

Answer 1

Your logger is using UTC time. If you show us your code it would be possible to say exactly why.

Answer 2

I think it is significant that 4 hours ahead is GMT for you. Poking around logging's code - it seems that it uses time rather than datetime. Apparently they work differently in figuring out the localtime.

What does the following output?:

import time
print time.tzname

AFAIK, that controls the offset used by logging. According to the documentation, you want to tweak your "system's zoneinfo database to specify the timezone rules" (man tzfile).