class Extract(expression, lookup_name=None, tzinfo=None, **extra) [source] Extracts a component
class TruncMonth(expression, output_field=None, tzinfo=None, **extra) [source]
class Substr(expression, pos, length=None, **extra) [source] Returns a substring of length
class Lower(expression, **extra) [source] Accepts a single text field or expression and returns
class ExtractHour(expression, tzinfo=None, **extra) [source] lookup_name
class TruncDay(expression, output_field=None, tzinfo=None, **extra) [source]
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