Added functions to get first and last day of the year.

app/Http/helpers.php

@@ -106,6 +106,26 @@ function endOfMonth($year, $month, $format='d.m.Y') {
                         ->endOfMonth()->format($format);
 }
 
+/**
+ * Return the first day of a given year.
+ *
+ * @param string $year
+ * @return string E. g. 01.01.2018
+ */
+function firstDayOfYear($year, $format='d.m.Y') {
+    return Carbon\Carbon::parse('01.01.' . $year)->format($format);
+}
+
+/**
+ * Return the last day of a given year.
+ *
+ * @param string $year
+ * @return string E. g. 31.12.2018
+ */
+function lastDayOfYear($year, $format='d.m.Y') {
+    return Carbon\Carbon::parse('31.12.' . $year)->format($format);
+}
+
 /**
  * Check, if all fields of an array are null.
  * Returns true, if all fields of $array are null. Returns fals,e otherwise