View source for ISO 8601

Converting between ISO~8601 and Unix Timestamps.

Converting ISO~8601 strings to Python `datetime` objects is  straightforward:

<pre>
import dateutil.parser
tstr = "2008-01-02T10:20:33-0800"
t = dateutil.parser.parse(tstr)
</pre>

These objects can then be converted to Unix timestamps:

<pre>
import time
tval = time.mktime(t.timetuple())
</pre>

Java programmers can use the Java function `javax.xml.bind.DatatypeConverter.parseDateTime`.

With Python Conversion from Unix timestamp values to ISO~8601 needs to
be augmented with an explicit GMT reference, since this is not
provided by Python's `datetime` package, which is unaware of UTC offsets:

<pre>
>>> dt = datetime.datetime.utcfromtimestamp(101106)
>>> dt.isoformat()+"Z"
'1970-01-02T04:05:06Z'
</pre>

The conversion can also be performed with
the function \emph{strftime} that is present in many programming
languages. This function allows conversion to either GMT or local
time. Once again, the programmer needs to be cognizant of the need to
explicitly reference the UTC offset:

<pre>
>>> t = 101106
>>> time.strftime("%FT%TZ",time.gmtime(t))                                                                              
'1970-01-02T04:05:06Z'
>>> time.strftime("%FT%T%z",time.localtime(t))                                                                          
'1970-01-01T23:05:06-0500'
</pre>