A python script for Linux, that converts a copied timestamp to date and shows it in a message box.

timestamp_to_date.py

try:
    import pyperclip
    import os
    from tkinter import Tk, messagebox
    import subprocess
except Exception as e:
    print("Import Error: Modules pyperclip and Tkinter are needed.")
    exit(1)


def executeCommand(command):
    try:
        subProcess = subprocess.Popen(
            command, shell=True, stdout=subprocess.PIPE)
        subProcess.wait()
        (output, _) = subProcess.communicate()
        opText = output.decode()
        return opText.strip()
    except Exception as exception:
        print(exception)
        exit(0)


def main(timestamp):
    top = Tk()
    top.withdraw()

    dateAndTime = executeCommand("date -d@"+timestamp)
    exitCode = executeCommand("echo $?")

    if exitCode == "0":
        messagebox.showinfo("Timestamp", timestamp+"\n"+dateAndTime)
    else:
        messagebox.showinfo("Timestamp", "Invalid timestamp!")


if __name__ == "__main__":
    timestamp = pyperclip.paste().strip()
    if timestamp.isnumeric():
        main(timestamp)