Winform: clock alert

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SessionManager__Demo
{
    public partial class timeCompare : Form
    {
        public timeCompare()
        {
            InitializeComponent();
            timer1.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            /*******************************************
             *          Display Current Time
             *******************************************/
            DateTime time1 = DateTime.Now;
            label1.Text = time1.ToString("hh:mm:ss:tt");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DateTime time1 = DateTime.Now;

            var time2 = time1.AddHours(0).AddMinutes(0).AddSeconds(0);
            var t2 = time2.ToString("hh:mm:ss:tt");

            label2.Text = t2;


            //compare time
            int compare = DateTime.Compare(time1, time2);

            if (compare == -1)
            {
                MessageBox.Show("time 1 is early");
            }else if (compare == 0)
            {
                MessageBox.Show("time 1 is same with time 2");
            }
            else
            {
                MessageBox.Show("time 1 is later");

            }


            
        }




    }
}