diff --git a/calendarview/src/main/java/com/othershe/calendarview/utils/CalendarUtil.java b/calendarview/src/main/java/com/othershe/calendarview/utils/CalendarUtil.java
index d717aa9..fc24bcb 100644
--- a/calendarview/src/main/java/com/othershe/calendarview/utils/CalendarUtil.java
+++ b/calendarview/src/main/java/com/othershe/calendarview/utils/CalendarUtil.java
@@ -162,7 +162,7 @@ public static int[] strToArray(String str) {
     public static long dateToMillis(int[] date) {
         int day = date.length == 2 ? 1 : date[2];
         Calendar calendar = Calendar.getInstance();
-        calendar.set(date[0], date[1], day);
+        calendar.set(date[0], date[1]-1, day);
         return calendar.getTimeInMillis();
     }