Deleting issue on sqlite3, python

[lucakim27]

I wanna delete a current dates tasks and im not sure how to delete a specific row which is combined between "Tasks" and "Date" field name in the table.
Thanks for your help in advance!

import tkinter as tk
from tkinter import ttk
from tkinter import messagebox
from tkcalendar import Calendar, DateEntry
import sqlite3 as sq

root = tk.Tk()
root.title('Planner')
root.geometry("530x300+500+500")

#  Making a database file called "planner.db"
conn = sq.connect('PlannerDB.db')

# The database will be saved in the location where your 'py' file is saved
cur = conn.cursor()

# Create table - PLANNER
cur.execute('''CREATE TABLE IF NOT EXISTS PLANNER
             ([Tasks] text, [Date] date)''')

task = []

# clear tkinter listbox
def clearList():
    t.delete(0,'end')


def addTask():
    word = e1.get()
    date = cal.get_date()
    rows = [(word, date)]
    if len(word)==0:
        messagebox.showinfo('Empty Entry', 'Enter task name')
    elif l1.cget("text")=="":
        messagebox.showinfo('Empty Entry', 'Enter date')
    else:
        task.append(word)
        cur.executemany('INSERT INTO PLANNER VALUES (?, ?)', rows)
        selectDate()
        e1.delete(0,'end')


# If the value you delete exists then it also gets deleted on any dates.
def delOne():
    try:
        val = t.get(t.curselection())
        cur.execute('DELETE FROM PLANNER WHERE Tasks = (?)', (val,))
        selectDate()
    except:
        messagebox.showinfo('Cannot Delete', 'No Task Item Selected')


def deleteAll():
    mb = messagebox.askyesno('Delete All','Are you sure?')
    date = cal.get_date()
    if mb==True:
        cur.execute('DELETE FROM PLANNER WHERE Date = (?)', (date,))
        selectDate()


def bye():
    root.destroy()


def selectDate():
    l1["text"] = cal.get_date()
    clearList()
    cur.execute("SELECT * FROM PLANNER")
    values = []
    for val in cur:
        if (str(cal.get_date()) == val[1]):
            values.append(val[0])

    for i in values:
        t.insert("end", i)


l1 = ttk.Label(root, text="")
l1.place(x=370 ,y=30)
l2 = ttk.Label(root, text='Enter down below')
e1 = ttk.Entry(root, width=21)
t = tk.Listbox(root, height=11, selectmode='SINGLE')
b1 = ttk.Button(root, text='Add task', width=20, command=addTask)
b2 = ttk.Button(root, text='Delete', width=20, command=delOne)
b3 = ttk.Button(root, text='Delete all', width=20, command=deleteAll)
b4 = ttk.Button(root, text='Exit', width=20, command=bye)
b5 = ttk.Button(root, text='Select', width=20, command=selectDate)
cal = DateEntry(root, width=30, bg="darkblue", fg="black", year=2021)
cal.grid()


#Place geometry
l2.place(x=90, y=50)
e1.place(x=50, y=80)
b1.place(x=40, y=110)
b2.place(x=40, y=140)
b3.place(x=40, y=170)
b4.place(x=40, y =200)
b5.place(x=300, y=0)
t.place(x=320, y=50)
root.mainloop()

conn.commit()
cur.close()