FR: 12 Hour Clock?

[JimmXinu]

Could the clock on the USBMS screen display 12 hour time when ["twelve_hour_clock"] = true is set in koreader settings?

USBMS has an example of how to read settings:

KoboUSBMS/usbms.c

Lines 479 to 495 in 726f5ef

	snprintf(ko_settings, sizeof(ko_settings) - 1U, "%s/settings.reader.lua", ko_dir);
	f = fopen(ko_settings, "re");
	if (f) {
	bool found_state = false;
	bool fl_state = false;
	bool found_intensity = false;
	uint8_t fl_intensity = 0U;
	char* line = NULL;
	line = calloc(PIPE_BUF, sizeof(*line));
	if (!line) {
	PFLOG(LOG_ERR, "calloc: %m");
	fclose(f);
	return intensity;
	}
	while (fgets(line, PIPE_BUF, f)) {
	char* cur_line = line;
	if (strstr(cur_line, "[\"is_frontlight_on\"]")) {

And the clock formatting code, currently:

KoboUSBMS/usbms.c

Line 716 in 726f5ef

strftime(sz_time, sizeof(sz_time), "%H:%M", lt);

...could conditionally display 12/24 hour clock something like:

	if (twelve_hour_clock) {
		strftime(sz_time, sizeof(sz_time), "%I:%M %p", lt);
	} else {
		strftime(sz_time, sizeof(sz_time), "%H:%M", lt);
	}

I'd offer a PR, but I don't have a build environ to test in, and how to implement reading the setting could go a couple different ways.