Failed to parse format specifier %u: Unrecognized format for strftime/strptime: %u

[ctsrc]

According to https://duckdb.org/docs/sql/functions/dateformat#format-specifiers

Specifier	Description	Example
…	…	…
%u	ISO 8601 weekday as a decimal number where 1 is Monday.	1, 2, …, 7
…	…	…
%w	Weekday as a decimal number.	0, 1, …, 6
…	…	…

But I try to do the following in my code:

let query =
        r"select
            make_timestamptz(id * 1000000) as ts,
            strftime(ts, '%H:%M') as s_hm,
            strftime(ts, '%z') as s_z,
            strftime(ts, '%u') as s_wd,
            id,
            v0,
            c0
          from points
          where s_hm = '12:00' and s_wd = '7'
          order by id desc
          limit 144";
    let mut stmt = db_conn.prepare(&query)?;
    let points_iter = stmt.query_map([], |row| {
        Ok(PointRowSelectSubsetExtraPlus {
            hm: row.get(1)?,
            z: row.get(2)?,
            wd: row.get(3)?,
            id: row.get(4)?,
            v0: row.get(5)?,
            c0: row.get(6)?,
        })
    })?;

And I get this error message:

Error: Invalid Input Error: Failed to parse format specifier %u: Unrecognized format for strftime/strptime: %u

Caused by:
    Error code 1: Unknown error code

Whereas using %w works. But I would like to use %u.

Platform is macOS