TclDateFields *, Tcl_Size, Tcl_Obj *const[],
			    Tcl_WideInt *rangesVal);
static int		ConvertUTCToLocalUsingC(Tcl_Interp *,
			    TclDateFields *, int);
static int		ConvertLocalToUTC(ClockClientData *, Tcl_Interp *,
			    TclDateFields *, Tcl_Obj *timezoneObj, int);
static int		ConvertLocalToUTCUsingTable(Tcl_Interp *,
			    TclDateFields *, Tcl_Size, Tcl_Obj *const[],
			    Tcl_WideInt *rangesVal);
static int		ConvertLocalToUTCUsingC(Tcl_Interp *,
			    TclDateFields *, int);
static Tcl_ObjCmdProc	ClockConfigureObjCmd;
static void		GetYearWeekDay(TclDateFields *, int);
static void		GetGregorianEraYearDay(TclDateFields *, int);
static void		GetJulianDayFromEraYearMonthDay(

 *----------------------------------------------------------------------
 */

static int
ConvertLocalToUTCUsingTable(
    Tcl_Interp *interp,		/* Tcl interpreter */
    TclDateFields *fields,	/* Time to convert, with 'seconds' filled in */
    Tcl_Size rowc,			/* Number of points at which time changes */
    Tcl_Obj *const rowv[],	/* Points at which time changes */
    Tcl_WideInt *rangesVal)	/* Return bounds for time period */
{
    Tcl_Obj *row;
    Tcl_Size cellc;
    Tcl_Obj **cellv;
    struct {

	} else {
	    temp.iso8601Year -= 1;
	}
	GetJulianDayFromEraYearWeekDay(&temp, changeover);
    }

    fields->iso8601Year = temp.iso8601Year;
    dayOfFiscalYear = (int)(fields->julianDay - temp.julianDay);
    fields->iso8601Week = (dayOfFiscalYear / 7) + 1;
    fields->dayOfWeek = (dayOfFiscalYear + 1) % 7;
    if (fields->dayOfWeek < 1) { /* Mon .. Sun == 1 .. 7 */
	fields->dayOfWeek += 7;
    }
}


static void
GetGregorianEraYearDay(
    TclDateFields *fields,	/* Date fields containing 'julianDay' */
    int changeover)		/* Gregorian transition date */
{
    Tcl_WideInt jday = fields->julianDay;
    Tcl_WideInt day;
    int year;
    int n;

    if (jday >= changeover) {
	/*
	 * Gregorian calendar.
	 */

	fields->gregorian = 1;
	year = 1;

	/*
	 * n = Number of 400-year cycles since 1 January, 1 CE in the
	 * proleptic Gregorian calendar. day = remaining days.
	 */

	day = jday - JDAY_1_JAN_1_CE_GREGORIAN;
	n = (int)(day / FOUR_CENTURIES);
	day %= FOUR_CENTURIES;
	if (day < 0) {
	    day += FOUR_CENTURIES;
	    n--;
	}
	year += 400 * n;

	/*
	 * n = number of centuries since the start of (year);
	 * day = remaining days
	 */

	n = (int)(day / ONE_CENTURY_GREGORIAN);
	day %= ONE_CENTURY_GREGORIAN;
	if (n > 3) {
	    /*
	     * 31 December in the last year of a 400-year cycle.
	     */

	    n = 3;

	day = jday - JDAY_1_JAN_1_CE_JULIAN;
    }

    /*
     * n = number of 4-year cycles; days = remaining days.
     */

    n = (int)(day / FOUR_YEARS);
    day %= FOUR_YEARS;
    if (day < 0) {
	day += FOUR_YEARS;
	n--;
    }
    year += 4 * n;

    /*
     * n = number of years; days = remaining days.
     */

    n = (int)(day / ONE_YEAR);
    day %= ONE_YEAR;
    if (n > 3) {
	/*
	 * 31 December of a leap year.
	 */

	n = 3;

    if (year <= 0) {
	fields->isBce = 1;
	fields->year = 1 - year;
    } else {
	fields->isBce = 0;
	fields->year = year;
    }
    fields->dayOfYear = (int)day + 1;
}

/*
 *----------------------------------------------------------------------
 *
 * GetMonthDay --
 *

 */

void
GetJulianDayFromEraYearMonthDay(
    TclDateFields *fields,	/* Date to convert */
    int changeover)		/* Gregorian transition date as a Julian Day */
{
    Tcl_WideInt ym1, ym1o4, ym1o100, ym1o400;
    int year, month, mm1, q, r;

    if (fields->isBce) {
	year = 1 - fields->year;
    } else {
	year = fields->year;
    }

    ret = ClockParseFmtScnArgs(&opts, &yy.date, objc, objv,
	    CLC_OP_SCN, "-base, -format, -gmt, -locale, -timezone or -validate");
    if (ret != TCL_OK) {
	goto done;
    }

    /* seconds are in localSeconds (relative base date), so reset time here */
    yySecondOfDay = yySeconds = yyMinutes = yyHour = 0;
    yyMeridian = MER24;

    /* If free scan */
    if (opts.formatObj == NULL) {
	/* Use compiled version of FreeScan - */

	/* [SB] TODO: Perhaps someday we'll localize the legacy code. Right now,

     * Assemble date, time, zone into seconds-from-epoch
     */

    if ((info->flags & (CLF_TIME | CLF_HAVEDATE)) == CLF_HAVEDATE) {
	yySecondOfDay = 0;
	info->flags |= CLF_ASSEMBLE_SECONDS;
    } else if (info->flags & CLF_TIME) {
	yySecondOfDay = TclToSeconds(yyHour, yyMinutes, (int)yySeconds, yyMeridian);
	info->flags |= CLF_ASSEMBLE_SECONDS;
    } else if ((info->flags & (CLF_DAYOFWEEK | CLF_HAVEDATE)) == CLF_DAYOFWEEK
	    || (info->flags & CLF_ORDINALMONTH)
	    || ((info->flags & CLF_RELCONV)
	    && (yyRelMonth != 0 || yyRelDay != 0))) {
	yySecondOfDay = 0;
	info->flags |= CLF_ASSEMBLE_SECONDS;

	    GetGregorianEraYearDay(&yydate, GREGORIAN_CHANGE_DATE);
	    GetMonthDay(&yydate);
	    GetYearWeekDay(&yydate, GREGORIAN_CHANGE_DATE);
	    info->flags &= ~CLF_ASSEMBLE_DATE;
	}

	/* add the requisite number of months */
	yyMonth += (int)yyRelMonth - 1;
	yyYear += yyMonth / 12;
	m = yyMonth % 12;
	/* compiler fix for signed-mod - wrap y, m = (0, -1) -> (-1, 11) */
	if (m < 0) {
	    m += 12;
	    yyYear--;
	}

	    break;
	case CLC_ADD_DAYS:
	    yyRelDay += offs;
	    break;
	case CLC_ADD_WEEKDAYS:
	    /* add number of week days (skipping Saturdays and Sundays)
	     * to a relative days value. */
	    offs = ClockWeekdaysOffs(yy.date.dayOfWeek, (int)offs);
	    yyRelDay += offs;
	    break;
	case CLC_ADD_HOURS:
	    yyRelSeconds += offs * 60 * 60;
	    break;
	case CLC_ADD_MINUTES:
	    yyRelSeconds += offs * 60;

#define WCHAR char
#define wcslen strlen
#define wcscmp strcmp
#define wcscpy strcpy
#endif
#define TZ_INIT_MARKER	((WCHAR *) INT2PTR(-1))

typedef struct {
    WCHAR *was;			/* Previous value of TZ. */
    long long lastRefresh;	/* Used for latency before next refresh. */
    size_t epoch;		/* Epoch, signals that TZ changed. */
    size_t envEpoch;		/* Last env epoch, for faster signaling,
				 * that TZ changed via TCL */
} ClockTzStatic;
static ClockTzStatic tz = {	/* Global timezone info; protected by