Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/_common/Patronage/PatronExtensions.cs

@@ -0,0 +1,33 @@
+namespace NadekoBot.Modules.Patronage;
+
+public static class PatronExtensions
+{
+    public static string ToFullName(this PatronTier tier)
+        => tier switch
+        {
+            _ => $"Patron Tier {tier}",
+        };
+
+    public static string ToFullName(this QuotaPer per)
+        => per.Humanize(LetterCasing.LowerCase);
+
+    public static DateTime DayOfNextMonth(this DateTime date, int day)
+    {
+        var nextMonth = date.AddMonths(1);
+        var dt = DateTime.SpecifyKind(new(nextMonth.Year, nextMonth.Month, day), DateTimeKind.Utc);
+        return dt;
+    }
+
+    public static DateTime FirstOfNextMonth(this DateTime date)
+        => date.DayOfNextMonth(1);
+
+    public static DateTime SecondOfNextMonth(this DateTime date)
+        => date.DayOfNextMonth(2);
+
+    public static string ToShortAndRelativeTimestampTag(this DateTime date)
+    {
+        var fullResetStr = TimestampTag.FromDateTime(date, TimestampTagStyles.ShortDateTime);
+        var relativeResetStr = TimestampTag.FromDateTime(date, TimestampTagStyles.Relative);
+        return $"{fullResetStr}\n{relativeResetStr}";
+    }
+}