Feat: Accept timestamps as valid date format for the !remindme command (#238)

Author: sthivaios

Commands/Reminders.cs

@@ -36,7 +36,24 @@ public async Task RemindMe(
             [RemainingText, Description("The text to send when the reminder triggers.")] string reminder
         )
         {
-            DateTime t = HumanDateParser.HumanDateParser.Parse(timetoParse);
+            string discordTimestampRegexExp = @"^<t:(\d+):?\w*>$";
+            Match matchesDiscordTimestamp = Regex.Match(timetoParse, discordTimestampRegexExp);
+
+
+            DateTime t;
+            if (matchesDiscordTimestamp.Success)
+            {
+                // parse as timestamp
+                // Extract the Unix timestamp from the matched pattern
+                long unixTimestamp = long.Parse(matchesDiscordTimestamp.Groups[1].Value);
+                // Convert the Unix timestamp to a DateTime object
+                t = DateTimeOffset.FromUnixTimeSeconds(unixTimestamp).DateTime;
+            }
+            else
+            {
+                t = HumanDateParser.HumanDateParser.Parse(timetoParse);
+            }
+            
             if (t <= DateTime.Now)
             {
                 await ctx.RespondAsync($"{Program.cfgjson.Emoji.Error} Time can't be in the past!");
@@ -49,6 +66,7 @@ public async Task RemindMe(
                 return;
             }
 #endif
+            
             string guildId;
 
             if (ctx.Channel.IsPrivate)