yyRelDay = 0;
	}

	/* relative time (seconds), if exceeds current date, do the day conversion and
	 * leave rest of the increment in yyRelSeconds to add it hereafter in UTC seconds */
	if (yyRelSeconds) {
	    int newSecs = yySecondOfDay + yyRelSeconds;
	    Tcl_WideInt newSecs = yySecondOfDay + yyRelSeconds;

	    /* if seconds increment outside of current date, increment day */
	    if (newSecs / SECONDS_PER_DAY != yySecondOfDay / SECONDS_PER_DAY) {

		yyRelDay += newSecs / SECONDS_PER_DAY;
		yySecondOfDay = 0;
		yyRelSeconds = newSecs % SECONDS_PER_DAY;

    ret = TCL_ERROR;

    /*
     * Find each offset and process date increment
     */

    for (i = 2; i < objc; i+=2) {
	/* bypass not integers (options, allready processed above) */
	/* bypass not integers (options, allready processed above in ClockParseFmtScnArgs) */
	if (TclGetWideIntFromObj(NULL, objv[i], &offs) != TCL_OK) {
	    continue;
	}
	if (objv[i]->typePtr == &tclBignumType) {
	    Tcl_SetObjResult(interp, dataPtr->literals[LIT_INTEGER_VALUE_TOO_LARGE]);
	    goto done;
	}
	/* get unit */
	if (Tcl_GetIndexFromObj(interp, objv[i+1], units, "unit", 0,
		&unitIndex) != TCL_OK) {
	    goto done;
	}
	if (objv[i]->typePtr == &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;
	}

	/* nothing to do if zero quantity */
	if (!offs) {
	    continue;
	}