Compare time in HH:MM format in C#

public int CompareTime(string t1, string t2)
        {

            int i = -1;

            int hr1 = Convert.ToInt32(t1.Split(':')[0]);
            int hr2 = Convert.ToInt32(t2.Split(':')[0]);

            int min1 = Convert.ToInt32(t1.Split(':')[1]);
            int min2 = Convert.ToInt32(t2.Split(':')[1]);

            if (hr2 == hr1)
            {
                if (min2 == min1)
                {
                    i = 0;
                }
                if (min2 > min1)
                {
                    i = 1;
                }
            }
            if (hr2 > hr1)
            {
                i = 1;
            }

            return i;
        }

public int CompareTime(string t1, string t2)
        {
            TimeSpan s1 = TimeSpan.Parse(t1);
            TimeSpan s2 = TimeSpan.Parse(t2);
            return s2.CompareTo(s1); 
        }

var t1 = DateTime.Now.ToString("HH:mm");
var t2 = "21:10";
var res = CompareTime(t1, t2);