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    <p><code>sla_list</code> contains the 3 values you asked for, so <code>sla_list[1]</code> is the end_out value, while <code>start_out</code> is <code>sla_list[2]</code>.</p> <p>Simply apply your calculation to those two values:</p> <pre><code>timedelta = sla_list[1] - sla_list[2] timedelta = '%02d:%02d' % divmod(timedelta.total_seconds(), 60) </code></pre> <p>I replaced your <code>time.gmtime(timedelta)</code> and <code>strftime</code> dance with a simpler method using the <a href="http://docs.python.org/library/functions.html#divmod" rel="nofollow"><code>divmod()</code> function</a>; all you need to do is turn the total number of seconds into hours (seconds divided by 60) and remaining seconds (seconds modulo 60), after all.</p> <p>If you need sum the timedeltas per <code>service__name</code> entry, order by by that entry and use the <a href="http://docs.python.org/library/itertools.html#itertools.groupby" rel="nofollow"><code>itertools.groupby</code> callable</a> to calculate your sums quickly and efficiently:</p> <pre><code>from itertools import groupby from operator import itemgetter sla_list = self.object_list.filter(types__name="Unplanned").filter(service__sla=True).order_by('service__name').values_list('service__name', 'end_out', 'start_out') sla_deltas = {} for name, entries in groupby(sla_list, itemgetter(0)): sla_deltas[name] = sum(end - start for name, end, start in entries) </code></pre> <p>The <code>groupby</code> function gives you sub-lists with matching <code>sla__name</code> values, we simply calculate the <code>datetime.timedelta</code> for each entry and use <code>sum()</code> to calculate the total timedelta.</p>
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    1. COI got that part but I am not sure how to implement it in my code. Once I return the timedelta I want to find all service__name that are the same and do a sum of the timedelte.
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    2. CO@Ross: That is *far* from clear from your question. In your post you are asking how to access the datetime objects in a tuple, not how to combine the timedeltas for matching service names.
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    3. CO@Ross: I've updated my answer to sum all timedeltas for all a given `service__name`. Next time, please make it clear in your answer what you expect :-)
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