ClockFmtScnCmdArgs *opts);
static Tcl_ObjCmdProc	ClockAddObjCmd;
static int		ClockValidDate(DateInfo *,
			    ClockFmtScnCmdArgs *, int stage);
static struct tm *	ThreadSafeLocalTime(const time_t *);
static size_t		TzsetIfNecessary(void);
static void		ClockDeleteCmdProc(void *);
static Tcl_ObjCmdProc	ClockSafeCatchCmd;
static void		ClockFinalize(void *);
/*
 * Structure containing description of "native" clock commands to create.
 */

struct ClockCommand {
    const char *name;		/* The tail of the command name. The full name

    {"seconds",		ClockSecondsObjCmd,	TclCompileClockReadingCmd, INT2PTR(CLOCK_READ_SECS)},
    {"ConvertLocalToUTC", ClockConvertlocaltoutcObjCmd,		NULL, NULL},
    {"GetDateFields",	  ClockGetdatefieldsObjCmd,		NULL, NULL},
    {"GetJulianDayFromEraYearMonthDay",
		ClockGetjuliandayfromerayearmonthdayObjCmd,	NULL, NULL},
    {"GetJulianDayFromEraYearWeekDay",
		ClockGetjuliandayfromerayearweekdayObjCmd,	NULL, NULL},
    {"catch",		ClockSafeCatchCmd,	TclCompileBasicMin1ArgCmd, NULL},
    {"catch",		TclSafeCatchCmd,	TclCompileBasicMin1ArgCmd, NULL},
    {NULL, NULL, NULL, NULL}
};

/*
 *----------------------------------------------------------------------
 *
 * TclClockInit --

    }
    Tcl_GetTime(&now);
    TclNewUIntObj(timeObj, (Tcl_WideUInt)now.sec);

    Tcl_SetObjResult(interp, timeObj);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * ClockSafeCatchCmd --
 *
 *	Same as "::catch" command but avoids overwriting of interp state.
 *
 *	See [554117edde] for more info (and proper solution).
 *
 *----------------------------------------------------------------------
 */
int
ClockSafeCatchCmd(
    TCL_UNUSED(void *),
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    typedef struct {
	int status;		/* return code status */
	int flags;		/* Each remaining field saves the */
	int returnLevel;	/* corresponding field of the Interp */
	int returnCode;		/* struct. These fields taken together are */
	Tcl_Obj *errorInfo;	/* the "state" of the interp. */
	Tcl_Obj *errorCode;
	Tcl_Obj *returnOpts;
	Tcl_Obj *objResult;
	Tcl_Obj *errorStack;
	int resetErrorStack;
    } InterpState;

    Interp *iPtr = (Interp *)interp;
    int ret, flags = 0;
    InterpState *statePtr;

    if (objc == 1) {
	/* wrong # args : */
	return Tcl_CatchObjCmd(NULL, interp, objc, objv);
    }

    statePtr = (InterpState *)Tcl_SaveInterpState(interp, 0);
    if (!statePtr->errorInfo) {
	/* todo: avoid traced get of errorInfo here */
	TclInitObjRef(statePtr->errorInfo,
		Tcl_ObjGetVar2(interp, iPtr->eiVar, NULL, 0));
	flags |= ERR_LEGACY_COPY;
    }
    if (!statePtr->errorCode) {
	/* todo: avoid traced get of errorCode here */
	TclInitObjRef(statePtr->errorCode,
		Tcl_ObjGetVar2(interp, iPtr->ecVar, NULL, 0));
	flags |= ERR_LEGACY_COPY;
    }

    /* original catch */
    ret = Tcl_CatchObjCmd(NULL, interp, objc, objv);

    if (ret == TCL_ERROR) {
	Tcl_DiscardInterpState((Tcl_InterpState)statePtr);
	return TCL_ERROR;
    }
    /* overwrite result in state with catch result */
    TclSetObjRef(statePtr->objResult, Tcl_GetObjResult(interp));
    /* set result (together with restore state) to interpreter */
    (void) Tcl_RestoreInterpState(interp, (Tcl_InterpState)statePtr);
    /* todo: unless ERR_LEGACY_COPY not set in restore (branch [bug-554117edde] not merged yet) */
    iPtr->flags |= (flags & ERR_LEGACY_COPY);
    return ret;
}

/*
 *----------------------------------------------------------------------
 *
 * TzsetIfNecessary --
 *
 *	Calls the tzset() library function if the contents of the TZ