Function cpyWday

host/time/src/main/fmt.js:10–10

(d)

const pad = (n, w = 2) => String(n).padStart(w, "0");
// CPython tm_wday is Mon=0..Sun=6; JS getDay is Sun=0. Convert both ways.
const cpyWday = (d) => (d + 6) % 7;
const jsDay = (cpy) => (cpy + 1) % 7;

// Date -> struct_time JSON, CPython order (Y, m, d, H, M, S, wday, yday, isdst).