计算时间差

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
/// <summary>
/// 从过去的时间到当前的时间，实时更新
/// </summary>
public class Time : MonoBehaviour {

    //用来显示时间的Text
    public Text text;

    //过去的时间
    DateTime pauseT;

    //当前的时间
    DateTime resumeT;

    void Start() {
        pauseT = Convert.ToDateTime("2016-10-1 22:00:34");
    }

    void Update()
    {
        resumeT = DateTime.Now;

        if (pauseT.Year!=resumeT.Year)
        {
            TimeSpan ts1 = new TimeSpan(pauseT.Ticks);

            TimeSpan ts2 = new TimeSpan(resumeT.Ticks);

            TimeSpan tsSub = ts1.Subtract(ts2).Duration();

            text.text ="已经过去了"+tsSub.Days + "天" + tsSub.Hours + "时" + tsSub.Minutes + "分" + tsSub.Seconds+"秒";
        }
    }
    
}