Calculate the next date using periodicity strategies.

All these strategies encapsulate how the Carbon library adds the
interval to the current date.

Monthly, Quarterly, Half-Yearly, and Yearly explicitly use the
overflow control to guarantee the end of the next month or year
adequately.

app/Support/Calendar/Periodicity/Daily.php

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Copyright (c) 2023 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Support\Calendar\Periodicity;
+
+use Carbon\Carbon;
+
+final class Daily extends Interval
+{
+    public function nextDate(Carbon $date, int $interval = 1): Carbon
+    {
+        return ($date->clone())->addDays($this->skip($interval));
+    }
+}