source: binary-improvements/7dtd-server-fixes/src/TelnetCommands/SetTimeReal.cs@ 123

using System;

public class SetTimeReal : ConsoleCommand
{
        public SetTimeReal (ConsoleSdtd cons) : base(cons)
        {
        }

        public override string Description ()
        {
                return "set current ingame time, params: <day> <hour> <min>";
        }

        public override string[] Names ()
        {
                return new string[] { "settimereal", "str" };
        }

        public override void Run (string[] _params)
        {
                try {
                        if (_params.Length != 3) {
                                m_Console.SendResult ("Usage: settimereal <day> <hour> <min>");
                                return;
                        }

                        int day, hour, min;
                        if (!int.TryParse (_params [0], out day)) {
                                m_Console.SendResult ("Could not parse day number \"" + _params [0] + "\"");
                                return;
                        }
                        if (day < 1) {
                                m_Console.SendResult ("Day must be >= 1");
                                return;
                        }
                        if (!int.TryParse (_params [1], out hour)) {
                                m_Console.SendResult ("Could not parse hour \"" + _params [1] + "\"");
                                return;
                        }
                        if (hour > 23) {
                                m_Console.SendResult ("Hour must be <= 23");
                                return;
                        }
                        if (!int.TryParse (_params [2], out min)) {
                                m_Console.SendResult ("Could not parse minute \"" + _params [2] + "\"");
                                return;
                        }
                        if (min > 59) {
                                m_Console.SendResult ("Minute must be <= 59");
                                return;
                        }
                        if ((day < 1) || (hour < 8 && day < 1)) {
                                m_Console.SendResult ("Time may not be prior to day 1, 8:00");
                                return;
                        }

                        ulong time = ((ulong)(day - 1) * 24000) + ((ulong)hour * 1000) + ((ulong)min * 1000 / 60) - 8000;
                        m_Console.gameManager.World.gameTime = time;
                        m_Console.SendResult (String.Format ("Set time to Day {0}, {1:00}:{2:00} = {3}", day, hour, min, time));
                } catch (Exception e) {
                        Log.Out ("Error in SetTimeReal.Run: " + e);
                }
        }
}