source: binary-improvements/7dtd-server-fixes/src/TelnetCommands/SetTimeReal.cs@ 93

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)
        {
                if (_params.Length != 3) {
                        m_Console.md000a ("Usage: settimereal <day> <hour> <min>");
                        return;
                }

                int day, hour, min;
                if (!int.TryParse (_params [0], out day)) {
                        m_Console.md000a ("Could not parse day number \"" + _params [0] + "\"");
                        return;
                }
                if (day < 1) {
                        m_Console.md000a ("Day must be >= 1");
                        return;
                }
                if (!int.TryParse (_params [1], out hour)) {
                        m_Console.md000a ("Could not parse hour \"" + _params [1] + "\"");
                        return;
                }
                if (hour > 23) {
                        m_Console.md000a ("Hour must be <= 23");
                        return;
                }
                if (!int.TryParse (_params [2], out min)) {
                        m_Console.md000a ("Could not parse minute \"" + _params [2] + "\"");
                        return;
                }
                if (min > 59) {
                        m_Console.md000a ("Minute must be <= 59");
                        return;
                }
                if ((day < 1) || (hour < 8 && day < 1)) {
                        m_Console.md000a ("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;
                this.m_Console.gameManager.World.gameTime = time;
                m_Console.md000a (String.Format ("Set time to Day {0}, {1:00}:{2:00} = {3}", day, hour, min, time));
        }
}