I was curious, so I took a look at how django does the year/day/month
selects. They use a backend specific lookup. This is how you could
do it using postgres.
em.LoggedEvent.objects.filter().extra(where=['extract(MINUTE from
event_loggedevent.when) < 20'])
SQLite doesn't support extract, so django fakes it. It looks like
Mysql does.
If you have a small number of items you could do
vals=em.LoggedEvent.objects.filter().values('id','when')
matches=[d['id'] for d in vals if d['when'].minute < 20]
events=LoggedEvent.objects.filter(pk__in=matches)
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