PyQt5 – Days From Date Calculator

In this article we will see how we can create a days from date calculator in PyQt5, days from date calculator is used to add or subtract the days from the selected date to get the new date. This calculator is used to get the exact date which would come after given number of days. Below is how the calculator will like

PyQt5 is cross-platform GUI toolkit, a set of python bindings for Qt v5. One can develop an interactive desktop application with so much ease because of the tools and simplicity provided by this library. Below is the command to install the PyQt5

pip install PyQt5

GUI Implementation Steps :
1. Create a heading label that display the calculator name
2. Create label to show user to select the date
3. Create a QCalendarWidget object for user to select the date
4. Create a label and spin box for telling user to enter days and get the days
5. Create two push buttons for adding and subtracting the days
6. Create a label to show the calculated date

Back-End Implementation :
1. Add action to both the push button
2. Inside the add push button action get the days and call the calculate method and pass days as argument
3. Inside the subtract push button action get the days and make the days negative and call the calculate method and pass days as argument
4. Inside the calculate method get the selected date of the calendar
5. Add the passed days to the selected date
6. Show the new date with the help of result label

Below is the implementation

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# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import datetime
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # width of window
        self.w_width = 400
  
        # height of window
        self.w_height = 530
  
        # setting geometry
        self.setGeometry(100, 100, self.w_width, self.w_height)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
        # creating head label
        head = QLabel("+/- Days from a date Calculator", self)
  
        head.setWordWrap(True)
  
        # setting geometry to the head
        head.setGeometry(0, 10, 400, 60)
  
        # font
        font = QFont('Times', 15)
        font.setBold(True)
        font.setItalic(True)
        font.setUnderline(True)
  
        # setting font to the head
        head.setFont(font)
  
        # setting alignment of the head
        head.setAlignment(Qt.AlignCenter)
  
        # setting color effect to the head
        color = QGraphicsColorizeEffect(self)
        color.setColor(Qt.darkCyan)
        head.setGraphicsEffect(color)
  
        # creating a label
        b_label = QLabel("Select Date", self)
  
        # setting properties  label
        b_label.setAlignment(Qt.AlignCenter)
        b_label.setGeometry(50, 100, 300, 20)
        b_label.setStyleSheet("QLabel"
                              "{"
                              "border : 1px solid black;"
                              "background : rgba(70, 70, 70, 25);"
                              "}")
        b_label.setFont(QFont('Times', 9))
  
        # creating a calendar widget to select the date
        self.calendar = QCalendarWidget(self)
  
        # setting geometry of the calendar
        self.calendar.setGeometry(50, 120, 300, 180)
  
        # setting font to the calendar
        self.calendar.setFont(QFont('Times', 6))
  
  
        # creating a label
        days_label = QLabel("Days", self)
  
        # setting geometry to the label
        days_label.setGeometry(50, 320, 147, 40)
  
        # setting alignment
        days_label.setAlignment(Qt.AlignCenter)
  
        # setting stylesheet
        days_label.setStyleSheet("QLabel"
                                 "{"
                                 "border : 2px solid black;"
                                 "background : rgba(70, 70, 70, 35);"
                                 "}")
  
        days_label.setFont(QFont('Times', 9))
  
        # creating a spin box to get the days
        self.days = QSpinBox(self)
  
        # setting geometry to the spin box
        self.days.setGeometry(203, 320, 147, 40)
  
        # setting maximum value of spin box
        self.days.setMaximum(99999999)
  
        # setting font and alignment
        self.days.setFont(QFont('Times', 9))
        self.days.setAlignment(Qt.AlignCenter)
  
  
  
        # creating a push button
        add = QPushButton("Add Days", self)
  
        # setting geometry to the push button
        add.setGeometry(80, 380, 100, 40)
  
        # adding action to the button
        add.clicked.connect(self.add_action)
  
        # adding color effect to the push button
        color = QGraphicsColorizeEffect()
        color.setColor(Qt.blue)
        add.setGraphicsEffect(color)
  
        # creating a push button
        subtract = QPushButton("Subtract Days", self)
  
        # setting geometry to the push button
        subtract.setGeometry(220, 380, 100, 40)
  
        # adding action to the  button
        subtract.clicked.connect(self.subtract_action)
  
        # adding color effect to the push button
        color = QGraphicsColorizeEffect()
        color.setColor(Qt.red)
        subtract.setGraphicsEffect(color)
  
  
        # creating a label to show result
        self.result = QLabel(self)
  
        # setting properties to result label
        self.result.setAlignment(Qt.AlignCenter)
  
        # setting geometry
        self.result.setGeometry(50, 440, 300, 60)
  
        # making it multi line
        self.result.setWordWrap(True)
  
        # setting stylesheet
        # adding border and background
        self.result.setStyleSheet("QLabel"
                                  "{"
                                  "border : 3px solid black;"
                                  "background : white;"
                                  "}")
  
        # setting font
        self.result.setFont(QFont('Arial', 11))
  
    # method called by the add push button
    def add_action(self):
  
        # get the days from the spin box
        days = self.days.value()
  
        # call the calculate action
        self.calculate(days)
  
  
    # method called by the subtract push button
    def subtract_action(self):
  
        # get the days from the spin box
        # make the days value negative
        days = 0 - self.days.value()
  
        # call the calculate action
        self.calculate(days)
  
  
  
    def calculate(self, days):
  
        # get the selected date of calendar
        selected_date = self.calendar.selectedDate()
  
        # adding days to the selected days
        new_date = selected_date.addDays(days)
  
        # showing this date through label
        self.result.setText("Date : " + new_date.toString(Qt.ISODate))
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

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