[Help] How to Request real time from server / cloud on mobile device

Hi. I am developing a game in which i need to know the real time for some calculations. Does anybody know how to get the current date/time from the cloud or server on mobile devices (especially on Android). I am currently using System.UtcNow, but it is easy to cheat.

Thanks a lot!

 

Find a website that offers an HTTP response with the time. You can send a get request to the server, and read the response. It can all be done with Unity.

 

Thanks, I will try it.

 

The standard protocol for time synchronization is NTP, which is much cheaper to query. Here's a StackOverflow question containing a small C# NTP query function:

http://stackoverflow.com/questions/1193955/how-to-query-an-ntp-server-using-c

Bear in mind that although the protocol is relatively cheap, NTP servers can suffer horrific congestion. So:
* Consider using a pool such as time.nist.gov rather than a specific server
* Read the terms of service and make sure your app complies
* As with any UDP-based protocol, for the initial request if you don't receive a response then you do need to retry, but wait at least five seconds before doing so; if you still don't receive a response, wait longer and longer each time you retry
* For subsequent requests - if you really need them - wait as long as you can afford between requests. If possible, though, trust the device's internal clock, e.g. only query network time once and note the difference between the internal clock and network time, then apply that difference to the internal clock for all future time requirements.

 

That was really useful. Thanks gfoot.

 

I was using the stackoverflow answer and it was working well, but the App just got rejected by Apple because it didn't meet the new requirement to support IPv6 only networks. Does anyone have a solution that works for both IPv4 and IPv6?