Function get_day_of_week

numpy/core/src/multiarray/datetime_busday.c:27–39

Gets the day of the week for a datetime64[D] value */

/* Gets the day of the week for a datetime64[D] value */
static int
get_day_of_week(npy_datetime date)
{
    int day_of_week;

    /* Get the day of the week for 'date' (1970-01-05 is Monday) */
    day_of_week = (int)((date - 4) % 7);
    if (day_of_week < 0) {
        day_of_week += 7;
    }

    return day_of_week;
}

/*
 * Returns 1 if the date is a holiday (contained in the sorted