Begin adding cooldowns to specific commands

AriasServerUtils/TimeUtil.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+
+namespace AriasServerUtils
+{
+    public static class TimeUtil
+    {
+        private static readonly Dictionary<char, int> TimeUnits = new()
+        {
+            { 's', 1 },        // seconds
+            { 'm', 60 },       // minutes
+            { 'h', 3600 },     // hours
+            { 'd', 86400 },    // days
+            { 'w', 604800 },   // weeks
+            { 'M', 2592000 },  // months (approx. 30 days)
+            { 'y', 31536000 }  // years (365 days)
+        };
+
+        public static long DecodeTimeNotation(string input)
+        {
+            if (string.IsNullOrWhiteSpace(input)) return 0;
+
+            long totalSeconds = 0;
+            int number = 0;
+
+            foreach (char c in input)
+            {
+                if (char.IsDigit(c))
+                {
+                    number = number * 10 + (c - '0');
+                }
+                else if (TimeUnits.TryGetValue(c, out int unitSeconds))
+                {
+                    totalSeconds += number * unitSeconds;
+                    number = 0;
+                }
+                else
+                {
+                    throw new FormatException($"Invalid time unit: {c}");
+                }
+            }
+
+            return totalSeconds;
+        }
+
+        public static string EncodeTimeNotation(long seconds)
+        {
+            if (seconds <= 0) return "0s";
+
+            var result = new List<string>();
+
+            foreach (var (unit, unitSeconds) in TimeUnits.OrderByDescending(u => u.Value))
+            {
+                long value = seconds / unitSeconds;
+                if (value > 0)
+                {
+                    result.Add($"{value}{unit}");
+                    seconds %= unitSeconds;
+                }
+            }
+
+            return string.Join("", result);
+        }
+
+        public static long GetUnixEpochTimestamp()
+        {
+            return DateTimeOffset.UtcNow.ToUnixTimeSeconds();
+        }
+    }
+}