diff --git a/src/commonMain/kotlin/dev/inmo/krontab/internal/NearDateTimeCalculator.kt b/src/commonMain/kotlin/dev/inmo/krontab/internal/NearDateTimeCalculator.kt
index 7be2050..2e3576b 100644
--- a/src/commonMain/kotlin/dev/inmo/krontab/internal/NearDateTimeCalculator.kt
+++ b/src/commonMain/kotlin/dev/inmo/krontab/internal/NearDateTimeCalculator.kt
@@ -101,7 +101,7 @@ internal fun NearDateTimeCalculatorDays(
     times: Array<Byte>
 ) = CommonNearDateTimeCalculator(
     times,
-    { (it.dayOfMonth - 1).toByte() },
+    { (it.dayOfMonth - 1).toByte() }, // index1, so, decrease
     { dateTime, newOne ->
         val dateTime = (if (newOne < dateTime.dayOfMonth) {
             dateTime.plus(1.months)