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    <p>You need to make your datetime objects timezone aware. from the <a href="http://docs.python.org/library/datetime.html#module-datetime" rel="noreferrer">datetime docs</a>:</p> <blockquote> <p>There are two kinds of date and time objects: “naive” and “aware”. This distinction refers to whether the object has any notion of time zone, daylight saving time, or other kind of algorithmic or political time adjustment. Whether a naive datetime object represents Coordinated Universal Time (UTC), local time, or time in some other timezone is purely up to the program, just like it’s up to the program whether a particular number represents metres, miles, or mass. Naive datetime objects are easy to understand and to work with, at the cost of ignoring some aspects of reality.</p> </blockquote> <p>When you have an aware datetime object, you can use isoformat() and get the output you need.</p> <p>To make your datetime objects aware, you'll need to <a href="http://docs.python.org/library/datetime.html#datetime.datetime.strftime" rel="noreferrer">subclass tzinfo, like the second example in here</a>, or simpler - use a package that does it for you, like <a href="http://pytz.sourceforge.net/" rel="noreferrer">pytz</a> or <a href="http://labix.org/python-dateutil" rel="noreferrer">python-dateutil</a></p> <p>Using pytz, this would look like:</p> <pre><code>import datetime, pytz datetime.datetime.now(pytz.timezone('US/Central')).isoformat() </code></pre> <p>You can also control the output format, if you use strftime with the <a href="http://docs.python.org/library/datetime.html#strftime-and-strptime-behavior" rel="noreferrer">'%z' format directive</a> like</p> <pre><code>datetime.datetime.now(pytz.timezone('US/Central')).strftime('%Y-%m-%dT%H:%M:%S.%f%z') </code></pre>
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    1. POHow to get an isoformat datetime string including the default timezone?
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    1. USOfri Raviv
    1. USOfri Raviv
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    1. CONot entirely correct: the %z format directive prints the time zone offset without a colon, the ISO format however separates hours and minutes in the TZ specifier with a colon. However, calling the isoformat() method on a timezone-aware datetime will work!
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    2. COA timezone aware datetime will format correctly with .isoformat().
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      1. USDavid K. Hess
    3. COTo expand on the comment from @DavidK.Hess , the `strftime` in your second example is overly complicated. The following works and (imo) is cleaner: `datetime.now().replace(tzinfo=pytz.timezone("US/Eastern")).isoformat()`
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      1. USjedwards
 

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