diff --git a/src/Services/DateConverter.php b/src/Services/DateConverter.php
index e91c384..9c3e604 100644
--- a/src/Services/DateConverter.php
+++ b/src/Services/DateConverter.php
@@ -90,8 +90,8 @@ abstract class DateConverter
         78 => [2078, 31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
         79 => [2079, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
         80 => [2080, 31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30],
-        81 => [2081, 31, 31, 32, 32, 31, 30, 30, 30, 29, 30, 29, 31],
-        82 => [2082, 31, 32, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30],
+        81 => [2081, 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31],
+        82 => [2082, 31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30],
         83 => [2083, 31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30],
         84 => [2084, 31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30],
         85 => [2085, 31, 32, 31, 32, 30, 31, 30, 30, 29, 30, 30, 30],