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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def Date(value):
 """Custom type for managing dates in the command-line."""

    from datetime import datetime
    try:
        return datetime(*reversed([int(val) for val in value.split('/')]))
    except Exception as err:
        raise argparse.ArgumentTypeError("invalid date '%s'" % value)