class TruncDate(expression, **extra) [source] lookup_name =

class TruncDay(expression, output_field=None, tzinfo=None, **extra) [source]

class ExtractHour(expression, tzinfo=None, **extra) [source] lookup_name

class Substr(expression, pos, length=None, **extra) [source] Returns a substring of length

class TruncMonth(expression, output_field=None, tzinfo=None, **extra) [source]

class Lower(expression, **extra) [source] Accepts a single text field or expression and returns