[django]用日期来查询datetime类型字段

有一个model的字段是 DateTimeField,我现在要具体查询某一天date的数据，应该怎么用orm来查询呢？

指定年月日

YourModel.objects.filter(datetime_published__year='2008', 
                         datetime_published__month='03', 
                         datetime_published__day='27')
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字符串匹配

YourModel.objects.filter(your_datetime_field__startswith=datetime.date(2009,8,22))
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字符串包含

Mymodel.objects.filter(date_time_field__contains=datetime.date(1986, 7, 28))
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参考：How can I filter a date of a DateTimeField in Django?