int idx;
	    if (Tcl_GetIndexFromObj(interp, baseObj, nowOpts, "seconds",
		    TCL_EXACT, &idx) == TCL_OK
	    ) {
		goto baseNow;
	    }

	    if (TclHasInternalRep(baseObj, &tclBignumType)) {
		goto baseOverflow;
	    }

	    Tcl_AppendResult(interp, " or integer", NULL);
	    i = baseIdx;
	    goto badOption;
	}
	/*
	 * Seconds could be an unsigned number that overflowed. Make sure
	 * that it isn't. Additionally it may be too complex to calculate
	 * julianday etc (forwards/backwards) by too large/small values, thus
	 * just let accept a bit shorter values to avoid overflow.
	 * Note the year is currently an integer, thus avoid to overflow it also.
	 */

	if (TclHasInternalRep(baseObj, &tclBignumType)
	  || baseVal < TCL_MIN_SECONDS || baseVal > TCL_MAX_SECONDS
	) {
baseOverflow:
	    Tcl_SetObjResult(interp, dataPtr->literals[LIT_INTEGER_VALUE_TOO_LARGE]);
	    i = baseIdx;
	    goto badOption;
	}

	    continue;
	}
	/* get unit */
	if (Tcl_GetIndexFromObj(interp, objv[i+1], units, "unit", 0,
		&unitIndex) != TCL_OK) {
	    goto done;
	}
	if (TclHasInternalRep(objv[i], &tclBignumType)
	    || offs > (unitIndex < CLC_ADD_HOURS ? 0x7fffffff : TCL_MAX_SECONDS)
	    || offs < (unitIndex < CLC_ADD_HOURS ? -0x7fffffff : TCL_MIN_SECONDS)
	) {
	    Tcl_SetObjResult(interp, dataPtr->literals[LIT_INTEGER_VALUE_TOO_LARGE]);
	    goto done;
	}