def DateField(formatter=types.DEFAULT_DATE_FORMAT, default=NOTHING,
required=True, repr=True, cmp=True, key=None):
"""
Create new date field on a model.
:param default: any date or string that can be converted to a date value
:param bool required: whether or not the object is invalid if not provided.
:param bool repr: include this field should appear in object's repr.
:param bool cmp: include this field in generated comparison.
:param string key: override name of the value when converted to dict.
"""
default = _init_fields.init_default(required, default, None)
validator = _init_fields.init_validator(required, date)
converter = converters.to_date_field(formatter)
return attrib(default=default, convert=converter, validator=validator,
repr=repr, cmp=cmp,
metadata=dict(formatter=formatter, key=key))
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