Dates - simple date manipulation

A simple date manipulation script to showcase PySimpleGUI

Author: ehcelino

GUI/Dates/README.md

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+Dates is a simple script to demonstrate both the use of PySimpleGUI as an interface to python scripts,
+and basic date manipulation. 
+
+It requires PySimpleGUI==4.60.1
+
+Tested on Python 3.10
+
+
+Eduardo C. (https://github.com/ehcelino)

GUI/Dates/main.py

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+"""
+Dates - a simple graphic dates calculator
+Demonstrates the use of PySimpleGui as an interface
+and date arithmetics using module datetime and numpy.
+"""
+from datetime import datetime
+import PySimpleGUI as sg
+import numpy as np
+
+DATE_FRMT = '%m-%d-%Y'
+
+def days_between(date_one, date_two):
+    """
+    Determines how many days between dates.
+    :param date_one: date (us format) as string
+    :param date_two: date (us format) as string
+    :return: days as string
+    """
+    result = ''
+    try:
+        tmp_one = datetime.strptime(date_one, DATE_FRMT)
+        tmp_two = datetime.strptime(date_two, DATE_FRMT)
+    except ValueError as exc:
+        sg.popup('Error:', exc)
+    else:
+        mytimedelta = tmp_one - tmp_two
+        result = mytimedelta.days
+    return result
+
+def workdays_between(date_one, date_two):
+    """
+    Determines how many workdays between dates.
+    :param date_one: date (us format) as string
+    :param date_two: date (us format) as string
+    :return: days as int
+    """
+    result = ''
+    try:
+        tmp_one = datetime.strptime(date_one, DATE_FRMT)
+        tmp_two = datetime.strptime(date_two, DATE_FRMT)
+    except ValueError as exc:
+        sg.popup('Error:', exc)
+    else:
+        result = np.busday_count(tmp_one.strftime('%Y-%m-%d'), tmp_two.strftime('%Y-%m-%d'))
+    return result
+
+def main_window():
+    """
+    Defines the main window.
+    :return: PySimpleGUI Window object.
+    """
+    tsz = (8, 1) # Makes easier to define sizes to multiple elements.
+    isz = (15, 1)
+    # Everything bound by []'s goes on one line.
+    layout = [
+        [sg.Text('Date calculator', font='_ 12 bold')],
+        [sg.Text('Date format: US (mm-dd-yyyy', font='_ 10 italic')],
+        [sg.Text('Date one:', size=tsz),
+         sg.Input('', size=isz, key='-DATE01-')],
+        [sg.Text('Date two:', size=tsz),
+         sg.Input('', size=isz, key='-DATE02-')],
+        [sg.Text('Answer:', size=tsz),
+         sg.Input('', size=isz, key='-OUTPUT-')],
+        [sg.Push(), sg.Button('Days between dates', key='-BETWEEN-'), sg.Push()],
+        [sg.Push(), sg.Button('Working days bt. dates', key='-WORKING-'), sg.Push()],
+        [sg.Push(), sg.Button('Exit', key='-EXIT-')]
+    ]
+
+    return sg.Window('Date calculator!', layout, finalize=True)
+
+window = main_window()
+
+while True:  # This is the main loop.
+    event, values = window.read()
+
+    if event == '-BETWEEN-':
+        try:
+            window['-OUTPUT-'].update(value=str(abs(
+                days_between(values['-DATE01-'], values['-DATE02-']))))
+        except TypeError as err:
+            sg.popup('Error:', err)
+
+    if event == '-WORKING-':
+        try:
+            window['-OUTPUT-'].update(value=str(abs(
+                workdays_between(values['-DATE01-'], values['-DATE02-']))))
+        except TypeError as err:
+            sg.popup('Error:', err)
+
+    if event in (sg.WIN_CLOSED, '-EXIT-'):
+        break
+
+window.close()