public static class FloatExtension
{
    /// <summary>
    /// 将秒数转化为00:00:00格式
    /// </summary>
    /// <param name="time">秒数</param>
    /// <returns>00:00:00</returns>
    public static string ToTimeFormat(this float time)
    {
        //秒数取整
        int seconds = (int)time;
        //一小时为3600秒 秒数对3600取整即为小时
        int hour = seconds / 3600;
        //一分钟为60秒 秒数对3600取余再对60取整即为分钟
        int minute = seconds % 3600 / 60;
        //对3600取余再对60取余即为秒数
        seconds = seconds % 3600 % 60;
        //返回00:00:00时间格式
        return string.Format("{0:D2}:{1:D2}:{2:D2}", hour, minute, seconds);
    }
}

public class Foo : MonoBehaviour
{
    private void Start()
    {
        Debug.Log(300.38f.ToTimeFormat());
        Debug.Log(456.14f.ToTimeFormat());
        Debug.Log(48213.7f.ToTimeFormat());
    }
}

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