服务器python中的确切时间

Question

I've a script that read a db and send sms to user in a specific time, my server is in london and my country Guatemala is (-6 Hours), i use:

local_time = datetime.datetime.utcnow() + datetime.timedelta(hours=-6)

I'm afraid of Daylight could change and my sms is send incorrectly

Is there any way to control this?

Answer 1

You can use a library such as pytz to check the local time instead

>>> from pytz import timezone
>>> tz= timezone('America/Guatemala')
>>> from datetime import datetime
>>> tz.fromutc( datetime.utcnow() )
datetime.datetime(2014, 4, 22, 12, 4, 37, 2229, tzinfo=<DstTzInfo 'America/Guatemala' CST-1 day, 18:00:00 STD>)

The accuracy of the library is as good as the accuracy of the underlying timezone database, so if it doesn't suit your purposes, please consider contributing to it.

Answer 2

To get the current time in a given timezone:

from datetime import datetime
import pytz # $ pip install pytz

now = datetime.now(pytz.timezone('America/Guatemala'))

Example:

>>> print(now.strftime('%F %T %Z%z'))
2014-04-23 01:04:46 CST-0600

On *nix with tz database you could change your local timezone (stdlib-only solution):

import os
import time
from datetime import datetime, timezone

os.environ['TZ'] = ':America/Guatemala'
time.tzset()

# to get local time
print(datetime.now(timezone.utc).astimezone().strftime('%F %T %Z%z'))
# -> 2014-04-23 01:12:38 CST-0600