Polars Rust - Convert DataFrame Epoch Column in Milliseconds (i64) to a UTC date-formatted string

Polars Rust - Convert DataFrame Epoch Column in Milliseconds (i64) to a UTC date-formatted string

let date_utc_str_s: Series = Series::new(
    "date_utc_str",
    df
        .column("date")
        .unwrap()
        .cast(&DataType::Datetime(
            polars::datatypes::TimeUnit::Milliseconds,
            None))
        .unwrap()
        .strftime("%Y-%m-%dT%H:%M:%SZ")
        .unwrap());