Method: Polars::StringExpr#to_date

Defined in:
lib/polars/string_expr.rb

#to_date(format = nil, strict: true, exact: true, cache: true) ⇒ Expr

Convert a Utf8 column into a Date column.

Examples:

s = Polars::Series.new(["2020/01/01", "2020/02/01", "2020/03/01"])
s.str.to_date
# =>
# shape: (3,)
# Series: '' [date]
# [
#         2020-01-01
#         2020-02-01
#         2020-03-01
# ]

Parameters:

  • format (String) (defaults to: nil) —

    Format to use for conversion. Refer to the chrono crate documentation for the full specification. Example: "%Y-%m-%d". If set to nil (default), the format is inferred from the data.

  • strict (Boolean) (defaults to: true) —

    Raise an error if any conversion fails.

  • exact (Boolean) (defaults to: true) —

    Require an exact format match. If false, allow the format to match anywhere in the target string.

  • cache (Boolean) (defaults to: true) —

    Use a cache of unique, converted dates to apply the conversion.

Returns:



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# File 'lib/polars/string_expr.rb', line 40

def to_date(format = nil, strict: true, exact: true, cache: true)
  _validate_format_argument(format)
  Utils.wrap_expr(_rbexpr.str_to_date(format, strict, exact, cache))
end