直接上代码

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class DateChecker : MonoBehaviour
{private DateTime lastCheckedDate; //上次刷新日数据的日期private DateTime lastMonthUtc; //上次刷新月数据的日期TimeSpan NowOffestTime = TimeSpan.Zero;private void Start(){getServerTime();lastCheckedDate = DateTime.Parse(PlayerPrefs.GetString("LASTCHECKDATE", DateTime.MinValue.Date.ToString())); //DateTime.UtcNow.Date;lastMonthUtc = DateTime.Parse(PlayerPrefs.GetString("LASTMONTHDATE", DateTime.MinValue.Date.ToString()));//CheckAndUpdateData();}private void CheckAndUpdateData(){DateTime currentDate = GetNowTime();//DateTime.UtcNow.Date;if (currentDate > lastCheckedDate){PlayerPrefs.SetString("LASTCHECKDATE", currentDate.ToString());UpdateDailyData();lastCheckedDate = currentDate;}if (currentDate.Month > lastMonthUtc.Month || currentDate.Year > lastMonthUtc.Year) //每月刷新{PlayerPrefs.SetString("LASTMONTHDATE", currentDate.ToString());UpdateMonthData();lastMonthUtc = currentDate;}}private void UpdateDailyData(){//在这里写需要每日刷新的数据}private void UpdateMonthData(){//在这里写需要每月刷新的数据}/// <summary>/// 获取实际的网络时间 切系统时间也没用/// </summary>/// <returns></returns>public DateTime GetNowTime(){return DateTime.Now - NowOffestTime;}//获得服务器时间public void getServerTime(){string url = "https://github.com";StartCoroutine(IServerTime(url));}IEnumerator IServerTime(string url){Debug.Log("开始获取“+url+”的服务器时间（GMT DATE）");WWW www = new WWW(url);yield return www;if (www.isDone && string.IsNullOrEmpty(www.error)){Dictionary<string, string> resHeaders = www.responseHeaders;string key = "DATE";string value = null;if (resHeaders != null && resHeaders.ContainsKey(key)){resHeaders.TryGetValue(key, out value);}if (value == null){Debug.Log("DATE is null");yield break;}DateTime Gmt = GMT2Local(value);DateTime now = DateTime.Now;//if (IsNewerHour(now, Gmt)){//记录一下时间差 这就是用户手动改的时间与世界时间的间隔//之后调用GetNowTime()就是准确时间NowOffestTime = now - Gmt;CheckAndUpdateData();}}}/// <summary>/// GMT时间转成本地时间全世界各个时区都会自动转换/// </summary>/// <param name="gmt">字符串形式的GMT时间</param>/// <returns></returns>public DateTime GMT2Local(string gmt){DateTime dt = DateTime.MinValue;try{string pattern = "";if (gmt.IndexOf("+0") != -1){gmt = gmt.Replace("GMT", "");pattern = "ddd, dd MMM yyyy HH':'mm':'ss zzz";}if (gmt.ToUpper().IndexOf("GMT") != -1){pattern = "ddd, dd MMM yyyy HH':'mm':'ss 'GMT'";}if (pattern != ""){dt = DateTime.ParseExact(gmt, pattern, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AdjustToUniversal);dt = dt.ToLocalTime();}else{dt = Convert.ToDateTime(gmt);}}catch{}return dt;}/// <summary>/// time0:当下的日子/// time1:被比较的日子/// </summary>/// <param name="time0"></param>/// <param name="time1"></param>/// <returns></returns>public static bool IsNewerHour(DateTime time0, DateTime time1){bool isNewer = false;if (time0 > time1){if (time0.Year > time1.Year)isNewer = true;if (time0.Month > time1.Month)isNewer = true;if (time0.Day > time1.Day)isNewer = true;if (time0.Hour > time1.Hour)isNewer = true;}return isNewer;}
}

这个代码是抓取热门网站"https://github.com"的时间，然后解析出来，获取实时的网络时间，可根据自身情况选取其他热门网站（百度、阿里等等）。

根据实时的网络时间，每次登录时，根据时间来刷新游戏中每日和每月需要刷新的数据，直接将代码挂到预制体上就能使用，可根据自身需求进行功能调整~