将字符串时间转换为正常时间值，将小时数替换为正确的

var match = Regex.Match(\"25:05\", @\"^(\\d{2,}):(\\d{2})$\");
var hour = int.Parse(match.Groups[1].Value) % 24;
var min = int.Parse(match.Groups[2].Value);

// hour will be 1 and min 5

input.IndexOf()

input.SubString()

static TimeSpan ParseHHMM(string input)
{
    var match = Regex.Match(input, @\"^(\\d{2,}):(\\d{2})$\");
    var hour = int.Parse(match.Groups[1].Value) % 24;
    var min = int.Parse(match.Groups[2].Value);

    return new TimeSpan(hour, min, 0);
}

// Write to console
Console.WriteLine(ParseHHMM(\"25:05\").ToString(@\"hh\\:mm\"));