How not to display all x axis coordinate labels pyqt5

[quant]

How not to display all x axis coordinate labels pyqt5?
For example every 30 values.

It would also be good to find out how instead of indexes 1, 2, 3 ......195, 196 display datetime data, but without days off.

Data " file.txt" are located here https://drive.google.com/file/d/1nzf...ew?usp=sharing

from PyQt5 import QtCore, QtGui, QtWidgets, QtChart
from PyQt5.QtCore import Qt
import math
import numpy as np
import pandas as pd
 
df = pd.read_csv('file.txt',
                         index_col='DATE',
                         parse_dates=True,
                         infer_datetime_format=True)
 
 
date = df.iloc[:, 0].index.date
o = df.iloc[:, 0].values
h = df.iloc[:, 1].values
l = df.iloc[:, 2].values
z = df.iloc[:, 3].values
x = len(z)
x_ = x - 1
 
class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
 
        self.step = 30
        self._chart_view = QtChart.QChartView()
        self.scrollbar = QtWidgets.QScrollBar(
            QtCore.Qt.Horizontal,
            sliderMoved=self.onAxisSliderMoved,
            pageStep=self.step,
        )
 
 
        self.scrollbar.setRange(0, x_)
 
        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)
 
        lay = QtWidgets.QVBoxLayout(central_widget)
        for w in (self._chart_view, self.scrollbar):
            lay.addWidget(w)
 
        self._chart = QtChart.QChart()
        self._candlestick_serie = QtChart.QCandlestickSeries()
 
        tm = []
 
        for i in range(0, len(z)):
            o_ = o[i]
            h_ = h[i]
            l_ = l[i]
            c_ = z[i]
            self._candlestick_serie.append(QtChart.QCandlestickSet(o_, h_, l_, c_))
            tm.append(str(i))
 
        min_x, max_x = 0, x_
 
        self._chart.addSeries(self._candlestick_serie)
        self._chart.createDefaultAxes()
        self._chart.legend().hide()
        self._chart.axisX(self._candlestick_serie).setCategories(tm)
        self._chart_view.setChart(self._chart)
        self.lims = np.array([min_x, max_x])
        self.onAxisSliderMoved(self.scrollbar.value())
        self.adjust_axes(1, 31)
 
 
    def adjust_axes(self, value_min, value_max):
        if value_min > 0 and value_max > 0 and value_max <= x_ and value_max > value_min:
            self._chart.axisX(self._candlestick_serie).setRange(str(value_min), str(value_max))
 
    @QtCore.pyqtSlot(int)
    def onAxisSliderMoved(self, value):
        value2 = value + self.step
        value1 = value
        if value2 >= x_:
            value2 = x_
            value1 = value2 - self.step
        self.adjust_axes(math.floor(value1), math.ceil(value2))
 
 
 
if __name__ == "__main__":
    import sys
 
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

from PyQt5 import QtCore, QtGui, QtWidgets, QtChart
from PyQt5.QtCore import Qt
import math
import numpy as np
import pandas as pd

df = pd.read_csv('file.txt',
                         index_col='DATE',
                         parse_dates=True,
                         infer_datetime_format=True)


date = df.iloc[:, 0].index.date
o = df.iloc[:, 0].values
h = df.iloc[:, 1].values
l = df.iloc[:, 2].values
z = df.iloc[:, 3].values
x = len(z)
x_ = x - 1

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.step = 30
        self._chart_view = QtChart.QChartView()
        self.scrollbar = QtWidgets.QScrollBar(
            QtCore.Qt.Horizontal,
            sliderMoved=self.onAxisSliderMoved,
            pageStep=self.step,
        )


        self.scrollbar.setRange(0, x_)

        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)

        lay = QtWidgets.QVBoxLayout(central_widget)
        for w in (self._chart_view, self.scrollbar):
            lay.addWidget(w)

        self._chart = QtChart.QChart()
        self._candlestick_serie = QtChart.QCandlestickSeries()

        tm = []

        for i in range(0, len(z)):
            o_ = o[i]
            h_ = h[i]
            l_ = l[i]
            c_ = z[i]
            self._candlestick_serie.append(QtChart.QCandlestickSet(o_, h_, l_, c_))
            tm.append(str(i))

        min_x, max_x = 0, x_

        self._chart.addSeries(self._candlestick_serie)
        self._chart.createDefaultAxes()
        self._chart.legend().hide()
        self._chart.axisX(self._candlestick_serie).setCategories(tm)
        self._chart_view.setChart(self._chart)
        self.lims = np.array([min_x, max_x])
        self.onAxisSliderMoved(self.scrollbar.value())
        self.adjust_axes(1, 31)


    def adjust_axes(self, value_min, value_max):
        if value_min > 0 and value_max > 0 and value_max <= x_ and value_max > value_min:
            self._chart.axisX(self._candlestick_serie).setRange(str(value_min), str(value_max))

    @QtCore.pyqtSlot(int)
    def onAxisSliderMoved(self, value):
        value2 = value + self.step
        value1 = value
        if value2 >= x_:
            value2 = x_
            value1 = value2 - self.step
        self.adjust_axes(math.floor(value1), math.ceil(value2))



if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

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